your vet will/should give you detailed instructions on how to care for her the best after surgery. she of course will have to stay the night at the vet clinic and when she does come home she will not be feeling up to par..at least for a day or two. just try to keep her settled. don't encourage her to be super active by trying to play with her. just let her stay at a pace that she's comfortable with, and if you let her sleep in your bed; don't let her jump up or off of it for at least a week. when a dog get's SPAYED, the vet is completely removing organs and the remainder of her organs have to re-adjust to the new space. it's like something is missing and the configuration of everything has to slightly move and settle in before she can really get back to normal. good luck!