Is she spayed? Some older *** suffer from incontinence in later life, and propalin syrup works well with most. But you will need a prescription from your vet.
Possibly diabetes. We had an old cat that became diabetic in old age with similar symptoms . We had to inject him with insulin twice a day. Get your vet to check her out.
Aah, I thought you meant the urine had been cleared by the vet, I get you know, you mean it is clear in colour. It could be a kidney problem, I would get a sample and take it along to the vet.