Government supporter (2007–12)

Vučković received the fifty-first position on the DS's electoral list in the 2007 Serbian parliamentary election. The list won sixty-four seats, and on this occasion she was awarded a mandate.^[9][10] The DS formed an unstable coalition government after the election with the Democratic Party of Serbia (DSS) and G17 Plus, and Vučković served as a supporter of the administration. During her first term, she was a member of the committee on foreign affairs, the committee on development and international economic relations, and the committee on European integration.^[11]

The DS–DSS coalition fell apart in early 2008, and another parliamentary election was called for May of that year. Vučković was given the thirty-second position on the DS's For a European Serbia (ZES) coalition list and was awarded a mandate for a second term when the list won 102 out of 250 seats.^[12][13] The overall results of the election were inconclusive, but For a European Serbia eventually formed a new coalition government with the Socialist Party of Serbia (SPS), and Vučković continued to serve with the government's parliamentary majority. In her second term, she was a member of the foreign affairs committee, the European integration committee, and the administrative committee, and a deputy member of the education committee, the committee on constitutional affairs, and the committee on defence and security.

Vučković chaired Serbia's parliamentary friendship group with France in this sitting of the assembly and oversaw a meeting of French and Serbian parliamentarians in Belgrade in April 2010. She remarked that the visit was an opportunity for Serbian parliamentarians to review their country's priorities, one of the most important of which was joining the European Union.^[14] She was a member of Serbia's delegation to the parliamentary assembly of the Francophonie in this period and was also a member of the friendship groups with the Netherlands and Spain.^[15]

Opposition member (2012–20)

Serbia's electoral system was reformed in 2011, such that parliamentary mandates were awarded to candidates on successful lists in numerical order. Vučković received the twenty-seventh position on the DS's Choice for a Better Life list in the 2012 parliamentary election and was re-elected when the list won sixty-seven seats.^[16] The Serbian Progressive Party (SNS) and the Socialist Party formed a new coalition government after the election, and the DS moved into opposition. Vučković chaired the European integration committee in the sitting of the assembly that followed.^[17] She continued to serve on the foreign affairs committee and was a member of the friendship groups with France, Germany, and the United States of America.^[18]

After the 2012 election, the DS became divided between supporters of former Serbian president Boris Tadić and Dragan Đilas, who succeeded Tadić as party leader in November 2012. Vučković supported Tadić, and in a bid to ensure party unity she was elected as a vice-president at the conference that chose Đilas as leader.^[19][20] Vučković later supported Dragan Šutanovac's bid for the DS leadership in Belgrade; rival candidate Balša Božović was instead chosen for the position amid deepening acrimony between the two camps.^[21] In early 2014, Tadić left the DS to create a breakaway group called the New Democratic Party (NDS), which was later renamed as the Social Democratic Party (SDS). Vučković chose to remain in the DS.

Vučković was promoted to the third position on the DS's list in the 2014 parliamentary election and was re-elected as the list fell to nineteen seats.^[22] Bojan Pajtić replaced Đilas as party leader later in the year, and Vučković was again chosen as a party vice-president.^[23] During her fourth assembly term, she was a member of the committee on European integration and the committee on administrative, budgetary, mandate, and immunity issues, a deputy member of the committee on constitutional affairs and legislation, the leader of Serbia's delegation to the assembly of the Francophonie, the leader of Serbia's friendship group with France, and a member of the friendship groups with Italy, Norway, and the United States.^[24]

She again received the third position on the DS's list in the 2016 parliamentary election and was elected to a fifth term when the list won sixteen mandates.^[25] She considered running for the DS leadership when Pajtić resigned after the election, but ultimately she did not do so.^[26] In September 2016, she was narrowly defeated in her bid for re-election as a party vice-president.^[27] Vučković was an early supporter of Saša Janković in the 2017 Serbian presidential election; Janković was ultimately endorsed by the DS and finished a distant second against Aleksandar Vučić of the SNS.^[28]

In the 2016–20 parliament, Vučković was a member of the foreign affairs committee and the European integration committee; a deputy member of the committee on constitutional and legislature issues; a deputy member of the committee on the judiciary, public administration, and local self-government; a deputy member of the committee on labour, social issues, social inclusion, and poverty reduction; a member of Serbia's delegation to the Parliamentary Assembly of the Mediterranean; once again the leader of Serbia's friendship group with France; and a member of the friendship groups with Croatia, Germany, Poland, Slovenia, Sweden, the United Kingdom, and the United States.^[29]

Opposition to election boycott and departure from the DS (2019–20)

Several opposition parties, including the Democratic Party, began boycotting of the national assembly in early 2019, against the backdrop of significant protests against Serbia's SNS-led government. The DS later joined an opposition boycott of the 2020 Serbian parliamentary election.

Some DS politicians who opposed the boycott (most notably Gordana Čomić) left the party to contest the election on the list of the United Democratic Serbia (UDS) alliance. Vučković remained with the DS but publicly disagreed with the boycott and expressed support for Serbia 21, one of the main UDS parties.^[30] After the election, she reiterated her view that the boycott had been a mistake and expressed concerns about the DS's overall ideological direction, particularly in its willingness to co-operate with radical right-wing parties such as Dveri.^[31]

The DS expelled several high-profile members, including Vučković, in September 2020.^[32] In April 2021, Vučković said that the party's decline was a co-ordinated process that had been taking place over a period of decades.^[33]