A. As I'm sure your vet has told you it's pretty unusual for a dog to have had multiple UTI's starting at 8 weeks of age. I think it's likely that she has a congential problem, which means something didn't develop correctly inside or outside her body and it's making her prone to the UTI's.
There are a few bladder abnormalities that can contribute to UTIs, including urachal diverticulum (a little pouch or out-cropping of the bladder) and ectopic ureters (the ureters do not enter the bladder at the appropriate spot). On the outside, she could have a redundant vulvar fold, which is predisposing her to trapping fecal matter at her vulva, and the bacteria is ascending up to her bladder and causing recurrent UTIs.
The other possibility of that she got a UTI initially and it was never treated appropriately, i.e. The appropriate antibiotic wasn't used and it never really resolved, but it seems like it's coming back. I think this is less likely, as it's really uncommon to begin with to see UTI's in dogs this young. I also once saw a 4 month old dog with bladder cancer, but that's incredibly rare and I think highly unlikely in your dog.
Your question got cut off at the end but it sounded like you were about to say that she may have kidney problems. If that's right clearly this is becoming a serious problem for her.
Your dog needs a competent vet to work up this problem. It's likely that she's going to need some advanced imaging, including possibly an x-ray procedure called a cystogram and possibly an ultrasound. You might consider taking her to a veterinary internal medicine specialist at this point, if one is available in your area.
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