If you can at least get fluids in her and she keeps it down, that's good. Plain, unflavored pedialtye slowly syringed into her mouth will help keep her hydrated. After a few hours of her keeping that down, I'd give her some (a tablespoon to start with) plain rice with a little bit of low sodium chicken broth to make it moist and see how she does with that. After a meal or two of that, every few hours or so, add in some boiled unseasoned skinless boneless chicken breast, shredded.
I'm sure it's the anasthesia messing with her tummy, I know it makes me sick as can be
If she can't hold anything down at all, get her to the ER vet immediately.
Prayers headed your way that she's just fine, but if something doesn't feel right get her in right away!!!!