[1] Leander was successful on the junior golf circuit in Sweden, amassing 7 career titles.

[4] Leander made the cut at the 2017 Women's British Open at Kingsbarns Golf Links in Scotland.

[5][6] Leander turned professional early 2018 and started playing on the LET Access Series and the Swedish Golf Tour, where she won the 2018 Nes Open in Norway, having prevailed in a playoff against Frida Gustafsson-Spång.

In 2019, she was runner-up at the WPGA International Challenge in England, one stroke behind Manon De Roey.

In September, she won the Rose Ladies Open at Brocket Hall in England, three strokeas ahead of Noemí Jiménez Martín.