[3] Pettersson had shot 72, 70 and 65 to put herself in a spot to make a challenge for the title, but a disappointing 75 on the final day saw her finish in a tie for 6th.

[5] After Pettersson graduated in 2018, she turned professional and played on the Swedish Golf Tour, where she was runner-up behind Sara Kjellker at the Carpe Diem Beds Trophy, tied for third at the Skaftö Open behind Malene Krølbøll Hansen and Filippa Möörk, and successfully defeated Sofie Bringner in the final of the Swedish Matchplay Championship.

[1] In 2019, Pettersson joined the Symetra Tour, where her best finish was a solo third at the 2019 IOA Golf Classic, five strokes behind Marta Sanz Barrio.

[7] In December 2021, Pettersson finished in second place at the LET Q-School, on eight-under-par with rounds of 73, 71, 67, 70 and 72, securing a Ladies European Tour card for 2022.

In 2022, Pettersson held the clubhouse lead in the Skaftö Open at nine under, but had to settle for second place after Linn Grant shot back-to-back birdies on her final two holes to claim victory by one stroke.