Hello, my name is Dr Strand. I can try to help answer your question about Sally.
The excessive urination and even leakiness can be associated with her diabetes.
Diabetic dogs naturally drink more water and therefore urinate more frequently. Their bladders fill quickly and can therefore be prone to an "overflow" bladder if she is holding her urine for long periods.
Another possibility which would need to be ruled in or out by a urinalysis with her regular vet, is a secondary bladder infection.
Diabetics tend to have sugar in their urine which creates the perfect environment for a bacterial infection.
How do we regulate her diabetes? Weekly visits to the vet for blood sugar checks?
Another possibility is that her diabetes is becoming unregulated on her current insulin dose. She may need to be dropped off at her regular vets office for the day so they can run a glucose curve (ie taking sugar readings every 2 hours throughout the whole day). This will help to assess how she's responding to the current insulin dose and determine whether she needs an increase in insulin.
So first step would be a urinalysis and glucose curve with her regular vet. If neither of these tests are turning up the answer, we may have to run more extensive blood work. She also may be becoming more incontinent with age, which is exacerbated by the diabetes process. There are also medications to help manage incontinence if this is the case.
Hopefully this helps. Please feel free to respond with further specifics or questions