How to Stimulate cat to pee/poop after surgery?

My kitten got spayed over the weekend, she was under anaesthesia and passed urine when brought back home (3-4 times while still regaining consciousness). Had to crate her the night and the following day (morning) she peed in her potty tray. Everything went well throughout the day, she rested and preferred staying in her crate, walked around a little, now it’s nighttime and she hasn’t peed and I am beginning to get worried if she’s withholding… she has eaten well. Should I wait it out? How long do I wait? Even though she isn’t being completely “normal”, she seems to want to rest, she’s refusing to stay warm, and it’s very cold here. she’s been trying to get off her recovery suit (constantly licking). The doctor told us that the incision is very minute and there are no synthetic stitches so there’s no removal. Where I goto the veterinarian isn’t open 24/7 unfortunately… any tips on how I can help her.

Hello.  You havent said anything that suggests you need a different vet.  What country are you in? - If you are here in the UK then, by law, every closed vet sends their out of hours work to an open vet, whose number can usually be obtained from calling the usual vets' answerphone.   If there is a genuine concern that a cat has not passed water then I'm sure that an emergency vet would be happy to triage the situation over the phone.  If the bladder was completely emptied soon after surgery, then it might realistically take 12 hours for the cat to need to urinate again. Trying / squatting but failing to pass water, however long ago a cat emptied their bladder, would usually be urgent. Cats' urine sites are very important to them and their use can be affected by stress (with the best will in the world, it is hard to go through a spey operation without some degree of stress).  Having appropriate pain releif on board and somewhere to hide away to go to the toilet can both be very important.  Sometimes when owners report that cats are not urinating, the cat will be sneakily toileting somewhere else, so this is something else to watch out for.  If other cats are present in the household, the social dynamics can sometimes change while one cat is away and they may be reluctant to urinate where they sometimes did. So:  what to do.  1) call the emergency vet to be triaged - see how long theyre hppy to wait.  2) look around for hidden wet patches 3) consider an extra litter tray, close to your cat, in case they want somewhere different to urinate for social reasons 4) make sure that pain releif is adequate and that the cat can get in an out of their own tray. I hope that something in all of that is useful.