Cowley turned professional in October 2014 and joined the
LET Access Series in 2015, where she only made two cuts her first season. In 2016, her rookie season on the LET, she made three cuts in four starts and finished 16th in the Rookie of the Year ranking. In 2019, she recorded her first top-10 finish at the
Omega Dubai Moonlight Classic. Returning to play in Europe, she was runner-up 2021
Ladies Italian Open, a stroke behind
Lucie Malchirand, and finished the season 33rd in the Race to Costa Del Sol. In 2022, she was the next best-placed female at the
Scandinavian Mixed, a joint
European Tour and LET event, 14 strokes behind winner
Linn Grant. She also finished in a tie for 8th at the
KPMG Women's Irish Open and ended the season 24th in the rankings. In August, she lost a playoff to
Alexa Pano at the
ISPS Handa World Invitational, an event co-sanctioned by the
LPGA Tour. ==Amateur wins==