A daughter of a Swedish mother and a German father,[4] Aicher grew up in Sundsvall where she started skiing and joined the local Slalomklubb.

[5] In March 2019 she won the U16 Slalom of the FIS Children Cup, representing Sweden.

In 2020, she joined the German Ski Association, for the reason of "better training opportunities in the Alps".

[6] Three weeks later, Aicher represented Germany at the World Championships, where she won bronze medal in the team event.

That November on her eighteenth birthday, she made her World Cup debut in a parallel giant slalom at Lech/Zürs, Austria.