I agree, have her urine checked by a vet, it's very likely it's UTI. I had the same problem with Luna a while ago (and have it again now btw) and we first thought it was stress-related because we had just moved. If I would have had her checked a bit earlier maybe my guest bed could have been saved! But when the vet found out it's been struvite crystals, she recovered very quickly and the peeing thing stopped - till now!

Kirsten