I would ask them how the testing would change treatment. If it wouldn't then ask why not try a trial of the medication to see if that works.
If they suspect bladder tumors/polyps then ruling them out would be a good idea. Discuss with the vet what they want to rule out with the tests.
If she is spayed a hormone related incontinence isn't unreasonable to suspect and a trial of meds might tell you if that is the problem.
Hope this helps you!
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