I’m not a vet, and my big dumb cat is a boy, so I don’t have any experience with cats of my own, but between working for a spay-neuter clinic and volunteering for a TNR program, I can tell you how each of those places handled discharge instructions.
Depending on how old she is, how used to handling she is, etc… there’s the “feral” method - this is what the TNR program I used to volunteer with said: http://www.operationcatnip.org/info/display?PageID=12347
It’s not what you’d do for a pet kitty, but the ferals seemed to handle it well.
These are the instructions given out by a SNAP clinic I know:
http://snap-nc.org/PostSurgeryInstr.pdf
That’s what I’d personally go by, if Kitty would be OK in the house and you have a room she could be restricted to. Generally, the younger they are, the faster they recover from surgery, so if she’s a young thing, you can probably get away with a week of restricted activity, if everything is healing well.
Do you think she’ll handle life in the house OK, or would that be more stressful for her than just staying at the barn?