There's not much we can do, but make sure she is able to freely drink water as much as she wants to keep any infection diluted down and to keep any sludge flushing through. Even if the problem proves to be something else this won't do any harm. Did your vet ask you to try and collect a urine sample before the visit? Sometimes they give you a little plastic bottle to take it in - although I've picked one up before from our local pharmacy (for people use) and just used it for piggies! You can sit her in a little plastic tub until she pees and then transfer it to the bottle and keep overnight in the fridge if you have to.
Your vet will probably give her a good check over and feel her bladder and kidneys (which might make her squeak or flinch), then perhaps prescribe antibiotics and meloxicam painkiller to start if they think it is UTI. Good luck Coco x