Sederqvist is known for her comedy-duo with Linda P, particularly for the role as Karina in 'Winnie and Karina'. She co-wrote the feature film 'Winnie and Karina – The Movie' (2009).
She directed several TV series about the characters Winnie and Karina. Subsequently, she wrote the screenplay for the TV series 'Anstalten' (2011) and 'Rita' season 2 (2013). In 2019 she wrote the screenplay for 'Mom Squad'.
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