S.M.
I went through this with my daughter when she was about 10wks old. She was put on meds and the DR had all the tests that you mentioned run. The meds cleared up the UTI. The tests showed that everything was okay with her bladder and her kidneys. She had a few more UTIs while still under a year old. But we made it through them. It was determined that she had a lot of different allergies. Some were to food and some were to topical items (powders, soaps, fabric softners, certain diapers and wipes). So I had to monitor those things and it helped a lot. The good news is that she is 14 1/2 yrs old and I can still count the number of UTIs on both hands.
I wish you luck and hang in there. The VCOG will be tough, for you and her. But it is best to get those results and know what you are dealing with.