Hello,
I get my female rabbit castrated one month ago.
At first - you have to differ speying and castrating. If your rabbit is speyed the tubes will be only be ligated.
At a castration the tubes and the uterus will be removed. I myself prefer a castration of female rabbits because the hormones will be changed and the rabbit will become less aggressive and there are no more problems with pseudopregnancys. Last has been the reason for me to get my female rabbits castrated.
To your question:
When your rabbit went home you have to look after that she didn't cool down. If that happens the circulation will be break down. I've got a infrared-lamp for medical use. So offer the rabbit a warm place with infrared - but please choose it so, that the rabbit can leave the place. Otherwise it will get a heat stroke.
The second thing is - don't use the normal litter. For 8-10 days fill the litter pan with old towels or tissues for kitchen use. So you avoid infections at the lesion.
Maybe at the first two days you have to force feed your bun. So ask your vet for forcible tube feed.
The last thing you have to think about: what to do that the bun does not open the suture.
I made something like a "t-shirt" for my bun. I take a old sock and cut off the top - where the toes will be inside - and the cuff. After that I cut in four holes for the legs.
This "t-shirt" I dressed on my rabbit. It looks like this:
I thought I made a plan for such "rabbit-t-shirts" but I don't find it at the moment. I'll get on to look for.
Greetings Kristina