Where exactly is the pee smell? Give her a good sniff all over. If it's just her hind quarters, maybe she's just dribbling pee on herself, and then spreading the smell as she moves around. If so, a little bath, and/or some kitty wipes, and then cleaning the floors, might just do the trick. And then you can ask the vet for a sanitary trim, which might help to keep the pee out of the fur on her haunches.
However, if her fur smells like pee all over, I would call the vet and tell them about that and the excessive thirst. And when I say call the vet, I mean asap.
Kitties smelling strongly of pee, if it's not just that they've peed on themselves, is not normal. I'd be worried.
If she stops eating or becomes weak, that is potentially very urgent.
At the last vet visit, did they do bloodwork by any chance, or just an exam?