Lock on door
Ok after viewing "Amelia" quite a few times, I finally realized why she couldn't get out of her apartment while the doll was in the suitcase. It had messed up her lock and twisted it so it wouldn't open.
Now come on, how the heck did the doll get all the way up on top and do that? Granted nothing in this tale is realistic and it's pointless to ask these kinds of questions, but still I find it hard to believe it climbed up and messed up the lock. I guess it also locked all the windows. It must have been busy while she was taking her bath!
"There's never enough time, never enough" ~ BBM