Sarah was such a brat.

Well, maybe, and maybe not.

She was more caring towards the bro - but only because she had gone through so much trouble and effort to get him back, and her motivation for THAT was because she would otherwise get into so much trouble with parents, authorities, etc.

She still retained the childish brattiness, though, because we were shown she couldn't let go of the imaginary friends after all, to become a true adult or even teenager. What teen imagines room full of living dolls? Creepy.

So in the end, she didn't grow up.

I liked her but I think they messed up a great rain scene at the first of the movie and then didn't let her have a small wet tshirt showing from it.

Damn right!