That was the answer I was hoping not to get. I remember reading about a similar problem in one of the threads here. I think it was about a kid which got lost while he/she was hiding. But if I remember right, it was before the .05 update. Which version do you have? When you click menu, you can see it on the bottom left corner of the game screen. If you have an earlier version, you may want to update it. Please write back if she's still missing. Meanwhile I'll try to locate that thread I was talking about and see what's written there.

EDIT: I found the thread, but if I understand right, your problem is a bit different. Anyway here's the link:

Glitch? My kid went into the closet and didn't come out