She just needs to rest. They usually are woozy after the surgery and most of the time won't eat much, if any. I do rescue so I go through the spay recouping quite often and most of the time the females will vomit later in the day after coming out of surgery, so be prepaired for that. It's because of the anistesia(sp), but she'll be ok once it wears off. Congradulations, you and Belle are now official members of the Spayed Club.