It’s great you’re getting prepared! Best thing is to be ready with some pain meds (have the vet give you metacam), and have everything ready to syringe feed her in case she doesn’t want to eat that night. Also having some enticing favorite herbs will help. Some bunnies need to be syringe fed once or twice post-spay, and then usually they start getting back to normal.

Keep her area warm and comfortable. Usually they also appreciate it to be dark and quiet while they recover.

Also be sure not to fast her before the surgery. Some vets might ask you not to give a full huge salad, but they should never ask you to withhold all food or water. She should definitely have lots of hay leading up to it.