Mohta served as Joint Secretary and Additional Secretary (South) in the Ministry of External Affairs in New Delhi, and looked after India's relations with a large part of the Asia-Pacific region. She was charged with all political and bilateral matters relating to Australia, Brunei, Cambodia, East Timor, Fiji, Indonesia, Laos, Malaysia, New Zealand, Papua New Guinea, Philippines, Singapore, Thailand, Vietnam and all Pacific Island countries. She also headed the division in the Foreign Ministry charged with looking after work relating to the development of the new Nalanda University. She was Deputy Dean of the Indian Foreign Service Institute.
She was Ambassador of India to Poland and Lithuania from July 2011 to January 2015 and the Ambassador of India to Sweden and Latvia from November 2016 to July 2020. She served as the Director of The Nehru Centre and Minister (Culture) at the High Commission of India to the United Kingdom from 2006 to 2011, looking after cultural and community affairs for India in the UK. Prior to that she was the Deputy Director General of the Indian Council for Cultural Relations (ICCR) from 2005 to 2006. At the Ministry of External Affairs, she has served as Director and Joint Secretary (Pakistan), Director (Gulf), Director (External Publicity), Deputy Spokesperson, Director (United Nations Political), Officer on Special Duty (Press Relations), Under Secretary (Foreign Service Institute) and Under Secretary (Southern Africa).
She has also served at Indian Embassies in France, Nepal and Thailand, and in the Permanent Delegation of India to UNESCO in Paris.
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