Talk:The Nithing/@comment-175.213.179.189-20170607153739/@comment-24011615-20170621133108

Actually she rose as a Striga at age 7, then terrorized the castle for 7 years, so that she is 14 when Geralt lifts the curse but has the mind of a child.

Also a quest given by Foltest in The Witcher, Chapter 5 (Her Highness the Striga) pretty much goes the exact way as in the book if you choose to lift the curse.