She'll have a wound going virticaly down her stomach after the op, with stitches. She needs to be prevented from licking at this until the stitches are taken out (usually after 10 days). Your vet will prob giving you a collar (looks like a lampshade) to put onto her to keep her from licking her stitches, that's if she is licking. Some dogs leave them alone and others go mad at them. A babygro, with a hole for her tail cut in it, can also be put onto her to stop her at the stitches. It works well with some dogs while others are driven crazy by them. Always worth a shot though because the collar can be a bit upsetting for them. Keep the stitches clean, I clean then with some salty water daily but some vets recommend not going near them at all and some recommend cleaning then. When you collect her ask what they think.
She may or may not want to eat when she comes home that day, give her only a little food but if she vomits leave her without food. If she doesn't want any food, that's ok, they can be quite groggy and jsut want to sleep. Some dogs vomit a bit after being under anaesthetic, which is totally normal, but if it's excessive you may was to give the vet a buzz to make sure she's ok (there is usually no need for this at all). Also, if the next day she won't eat at all or is still vomiting after she eats, give the vet a call. They can give her an injection to settle her stomach. Plenty of dogs get diarrhea for a day or two after the opperation (usually from the anaesthetic). If this happens, feed her small meals throughout the day and it shoudl settle down quickly. After a day or two, she should be back to herself. If she is still very groggy the next day or generally not herself after a few days, give the vet a call to make sure everything is ok. Like people, dogs react differently to anaesthetic. If at any time you are unsure or concerned about anything, ring your vet - that's what they are there for!
Walking her for the 10 days she has the stitches in should be done on lead (don't let her off), on a dry path and she should be kept out of long grass. Vets tend to advise not letting the run around in general but this can be very difficult to stop, esp in the house. Try to keep her quiet as much as possible and try not to let her run up stairs or jump up onto things (rarely, they can pop a stitch if they stretch out their belly suddenly - this is not likely, but always better safe than sorry).
Keep an eye on the wound - it should look a bit better every day. If it gets very red, hot or gooy or there is a lot of swelling (some, minor swelling is normal) at the site a trip back to the vet will be in order. If she is at it a lot then the collar or babygro will need to be used to stop her at it. The stitches can get a bit itchy so the poor pet might be dying to get at them but you really have to try your best to not let her at them. Some dogs never go at the stitches and others are at them 24/7 - just keep an eye on her and do what you think is best for her.
Great to hear you are getting her done, hope it all goes smoothly for you (and your little lady). Keep us updated!