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I don't think it's this one, so this is just basically a long shot.
I actually read a short story called "Home Amelia School Amelia", the girl's name was Amelia. Her problem was in school she was this goody-goody girl but was a bitch at home. She was exposed when her teacher came for a random visit to her house. That's when she had a change of heart and became the mask.
Edited by Malco My DA account... I draw stuff sometimes!

There was kids book about this little girl who was a real bitch but then she has some kind of dream where she has to fix all the bad stuff she's done. When she wakes up she has a change of heart and apologizes to her parents about how bad she's been. For some reason I remember the girl's name started with A but can't remember anything else
Edited by Bootlebat