Brave girl! And good on you to neuter them! Give her a lot of cuddles and treats :)
For the pills: A stupidly good tip I’ve read on Lemmy a while back is butter! Cats love that stuff and it masks the bitterness of the medicine. Wash your hands after initial handling of the pill, rub them in a bit of butter between your fingers and optionally put them into a snack your cat likes. That way, I can give my one very picky cat its meds daily.
When our cat had this surgery, the vet told us that she should not jump and climb if possible. So, maybe set everything she likes up the way so she won’t have to climb/jump? Ours especially liked to crawl into our bedsheets afterwards, so I set up the bed on the ground for some nights.
And, if you have another cat: separate them if you can’t watch them. Cats can’t really recognise their fellows after a surgery (meds, wounds and the vet mask their normal smell) and might go a bit berserk on them.