The kid knew too much...
For a kid that has never been outside or had contact with nobody except her "dad".
And yes, he schooled her, but still?
Who tought her curse words? How she know about braids? She apparently knew what fake flowers where? And looking at the Barbie, she kinda knew it was wrong to look at the twat... And she knew that stuffed bunnies are awesome guardians.
Stuff like that. Anybody knows more stuff she should not have known about?