I used to do the same thing. In fact, I sometimes still do, of course, I cough it back up...but that's beside the point. Eating any less than three hours before going to bed (sleeping) is very bad for you, as your body slows down during the night. Be right on top of her and find out where she puts the stuff, the trash, when she gets it, where her "stash" is, if she has one, etc. Chack constantly.
"I'm the other daughter...I'm beautifully tragic."
-Elphaba "Thropp" aka The Wicked Witch of the West (from Wicked, the musical, though the book is also excellent, might I add)