fairy tales and fantasy
lack of consideration for others, and multiple pronunciations of "it's not fair" make her pretty insufferable. Sure, she has some good qualities, including intelligence, grit, and determination, but her immaturity makes it hard, For kids who know they must eventually grow up but aren't sure they want to take on the responsibilities of adulthood, appreciate if she was starting to take on the responsibilities of a teenager, which should reasonably include looking after her baby brother.
It's possible if Sarah was younger, it would be easier to forgive her youthful peevishness, but at 16, Sarah seems a bit old to feel so put-upon. After all, this is a character who gets mad at her baby brother for taking her teddy bear and whose room is full of toys and children's books. clearly active imagination,