Lightweight

Obenauf made her professional debut on 21 April 2014 at the EXPO Thun in Thun, Switzerland, scoring a four round unanimous decision victory over Amra Okugic.^[3]

In her eleventh fight, with a record of 9–1 (2 KO), she faced former Olympic gold medalist Katie Taylor on 10 December 2016 at the Manchester Arena, Manchester, in Taylor's second professional bout. The fight was televised live on Sky Sports Box Office as part of the undercard for the Anthony Joshua vs. Éric Molina heavyweight world title fight.^[4] Obenauf lost via points decision over six rounds.^[5] Obenauf attempted to establish herself as the aggressor from the opening bell, but the former Olympic champion used her defence to evade Obenauf's attacks and began stalking her around the ring while staying behind the jab, fighting in spurts and landing combination punches to the head and body. In the second round, Obenauf touched the canvas as the result of a counter left hook, but immediately rose to her feet to protest the referee scoring a knockdown. Obenauf had a moment of success in the third, catching Taylor with a right hook and a straight left that sent her opponent stumbling off-balance. In the fourth, Obenauf was on the receiving end of Taylor’s sharp jabs and fast combinations. Taylor began landing her speedy combinations with more frequency in the fifth, a round which saw Obenauf receive a cut above the left eye from an accidental clash of heads. A bloodied Obenauf saw out the final bell in round six to receive the second defeat of her professional career.^[6][7]

Her next fight came on 25 March 2017, against Maja Milenkovic at the Congress Center in Interlaken, Switzerland. Obenauf won the fight with an eighth round technical knockout (TKO) to capture the vacant WBF International female lightweight title.^[8][9]

Three months later, she fought undefeated former WBO interim super featherweight champion Ewa Brodnicka on 24 June 2017, at the Ergo Arena in Gdańsk, Poland. Obenauf suffered the third defeat of her career, losing via split decision over ten rounds, with two judges scoring the bout 96–93 and 95–94 in favour of Brodnicka while the third scored it 95–94 to Obenauf.^[10]

After winning her next two fights, she then fought undefeated British prospect Chantelle Cameron on 2 December 2017, at the Leicester Arena in Leicester, England, for the vacant IBO female lightweight title. Obenauf lost the fight via sixth round corner retirement (RTD) after Obenauf's corner withdrew her from the contest between rounds, suffering the first stoppage loss of her career.^[11]

Super featherweight

Following the defeat to Cameron, Obenauf fought another undefeated British prospect in Natasha Jonas, for Jonas' WBA International female super featherweight title, on 4 August 2018 at the Ice Arena Wales in Cardiff, Wales. Obenauf scored an upset victory with a fourth round TKO.^[12] Obenauf came out swinging from the opening bell, smothering the former Olympian with combinations to the head and landing a few clean, straight right hands. Jonas came back in the second, landing her own clean punches. In the final 40 seconds of round three, following an onslaught by Obenauf which culminated in a straight right hand, Jonas was dropped to the canvas. After seeing her opponent struggle back to her feet before the referee's count of ten, Obenauf unleashed a barrage of punches on Jonas, again ending with a right hand to put the British fighter down for a second time. Obenauf came out in the fourth employing the same tactics, walking Jonas down and throwing big shots. Halfway through the round, Obenauf landed another big right hand to put Jonas down for the third time. With Jonas' back against the ropes, Obenauf landed a right-left combination that caused her opponent's legs to buckle, with the referee on the verge of intervening. Obenauf landed another left hook that made Jonas sag into the ropes, at which point referee Michael Alexander stepped in and waved off the fight as Jonas' trainer Joe Gallagher threw in the towel with 18 seconds of the round remaining.^[13][14]

In her next fight she challenged IBF female super featherweight champion Maïva Hamadouche on 4 December 2018 at Zénith de Paris-La Villette in Paris, France. Obenauf lost in her first challenge of a major world title via fifth round RTD.^[15]

After defeating Monika Antonik in April 2019 via unanimous decision over six rounds, Obenauf challenged for her second super featherweight world title against reigning champion Terri Harper on 2 November 2019 at the Manchester Arena, with the IBO title on the line. The fight was on the undercard of the WBO super lightweight title fight between Christina Linardatou and Katie Taylor.^[16][17] Obenauf lost the fight via unanimous decision, with the judges' scorecards reading 97–93, 99–92 and 99–91.^[18]