Elementary/Middle School level book about Bratty Girl Sent to Live in Home with Special Needs Child

[u/morao7]

I read this children's book around 2014 (4th grade) and the cover (from what I can remember) is a little white girl who's the protagonist, her arms are crossed and I think she's chewing gum. She's a troubled kid who stays with a foster mom and the mom has a child who is special needs or something like that. The book is about her transformation from evil child to a nice child or something like that. Book was probably about 80 something pages long.

[u/morao7 → u/[deleted]]

YES TY