Here is a good link to info on spay procedures and what to ask your vet:
http://www.yorkietalk.com/forums/yor...-protocol.html
Also, every female is different and spaying is a major surgery, one of mine took quite a while to recover where another was ready to climb mount everest the next day
The important thing is to have good communication with your vet, and what to look for as signs of pain or discomfort after the procedure. Talk to your vet about pain management and what their procedures are.