Ask if they will let her come home after the surgery, how often to give pain medicine, and how much. When she should stop eating and drinking before the surgery, if they will feed her after she wakes up. If she potty's outside, keep her in a harness and a short leash so she isn't running around. The quieter she is, the better. I had to alter a onesie to fit mine, it isn't too bad to hand stitch a fold in one. I think a T-shirt that covers her belly would be good too. Watch her, make sure she eats and drinks. Oh, and even with the onesie on, I still caught her trying to lick the stitches. I think as they healed they itched.
Mandiesmom has great advice on feeding and pooping.
Be ready to hand feed if she won't eat. Canned pumpkin- the plain non spiced type is the kind to feed her. I add a tiny bit of karo to mine for flavor- LOL! I also add a bit (1/2 teaspoon) of karo to her full water dish, we've had low blood sugar though.
A can of wet canned food that if you need to feed that. You can thin with water and syringe into her. I'd ask the vet for a syringe before you take her home, they should have them and show you what to do to feed her with them. ( they should have a can or 2 of food to use too).
Hope she has a easy time with her surgery and recovery. Keep us posted on how she does, and how you're doing while she's there. I think I stayed on YT and read stuff while I waited for my call from the vet saying mine was ready to come home.