I would first talk to the vet who will be spaying her about what they use as far as sutures since there are a variety of ways that vet’s suture rabbits and then he/she can talk to you about the particular care/concerns for those types of sutures.
As for keeping her confined – it’s usually recommended at least for the first 3 or 4 days to keep them confined but you want to limit her activity for a full week.
When you talk to the vet about what type of sutures he/she uses also talk to them about pain medication. Spaying unlike neutering is very invasive and you WANT pain medication to take home for the first 3 or 4 days after the surgery. Don’t go home without it.
Most females take about 3 or 4 full days to recover. I would not expect her to want to eat right when you get her home. She will just want to be left alone – make sure to keep her area warm and free from drafts too. After anesthesia she may have a harder time regulating her body temperature. Honestly she will probably want to be left alone for the rest of the day to recover so try to limit fussing with her – I know that’s just our nature to want to fuss though but try to limit that so she can recover.
Also ask your vet about Critical Care – this is good to have on had for the next few day if she seems like she doesn’t want to eat which is highly likely. Try to entice her with some fresh fragrant greens that she likes (dill or kale or mint or basil). Most of the time the pellets are the last things you will see her eat and that could be 3 or 4 days later which is why you want critical care to handfeed her if needed.
You may also notice mushy poops and such a few days after the surgery – this is perfectly normal from the surgery (anesthesia, pain meds, etc…).