John,
you really need to put your faith in a Urologist that deals with a ton of bladder cancer and that person is going to be found at a major cancer center, urological center or university center.
This is not your ordinary cancer and it requires expert pathologists as well as urologists to keep on top of it. If you tell us where you are located we can refer you to one of the best.
Here's a paper on various tests for bladder cancer and as you can see there are many and there are many false positives and many false negatives and not all urologists especially those in a private practice are going to do the relevant tests. And many uro's do not see the tumors or the hidden ones..white light cystoscopy is not the best even if you are the best.
www.ncbi.nlm.nih.gov/pmc/articles/PMC2483317/
please let us help you and your sister navigate this for you and keep you healthy.
pat