I think it honestly just depends on the rabbit. It wouldn’t hurt to call your vet and ask what they recommend. Every bunny is different. I would just do my best to keep them comfortable and ask your rabbit savvy vet for any advice they suggest for pre and post surgery.

It depends on if it’s an overnight spay. So if you’re bun is staying overnight, you’ll want to pack their favorite greens, pellets, and maybe a treat or two for after the surgery. If you’re bringing her home the same day, bringing greens is still a good idea because it’ll encourage food consumption.
Post spay, you’ll want to limit her exercise space for 1-2 weeks. You really want to make sure she can’t jump or get into any funky positions that could open her site. For checking the incision, you can do this by offering her a treat and making her stand on her hind legs, this will let you get a quick glimpse at the site. You will need to check the site at least once or twice to keep an eye on leakages or infections. For medicine, you can squirt it on her greens, mix with a little banana, or cut up a baby carrot and squirt some on each piece. Those are all good methods for not having to force feed meds. Sometimes though, you might have to force it. You’ll want to make sure she’s eating and drinking normally. Some bunnies can have a bout of stasis after being fixed (my Bombur did), so it is crucial you really watch their behavior for that first week. If she appears to not be eating or pooping, feed her either a pellet and water mash, or Critical Care and get her to the vet to be checked.

Some vets will keep your bunny overnight (or for a couple days) after the surgery so that they can look after them, so check with your vet about when you’ll be bringing Cookie home. My bunny stayed at the vet for a couple days, so by the time she got home there was very little post-care involved.

One of the most important things to do when she gets home is to limit her exercise. Confine her to a small pen, and make sure there is nothing for her to jump onto (her litter box should be shallow as well). You also need to keep an eye on the area around her incision and make sure that she’s eating and pooping well. 

Your vet might give you medicine or extra instructions too.