You shouldn't really have a cat spayed before its first time in heat as it can cause problems with growth iirc, also with her being young the spaying might not have fully taken so take her to the vet and get her checked out.
KaHn
That's rubbish. Kittens can be spayed at 12 weeks old, and although some vets prefer to wait, it is an age limit set, not whether or not the cat has been in heat.