By the time she was five she had lost her eyesight due to cancer which started when she was eighteen months old.

In 2016 Jeremy Pryce became her coach and she joined the Goteborgs KIK club.

Two years later she was competing in the T11 category in Berlin where she won another gold medal after being Sweden's flag bearer at the 2018 European Championships.

[4] In 2020 she was supported financially by a campaign which raised money from Swedes who bought a particular pillow.

The money was shared between judoka Nicolina Pernheim, cyclist Louise Jannering and Karlsson in order that they could fund guides prior to the postponed 2020 Summer Paralympics in Tokyo.