You really should get a urine test...which is painful to watch a baby get a cathater, but if it's bacterial you need to know because while yours went away as a child, they can be painful and REQUIRE an antibiotic. If you get the test then you will know if it's bacterial and to give antibiotic. If its not bacterial, then no need for antibiotic. The test can tell....plus if the doc prescribes a bunch or meds, and it's not bacterial, then you can just not fill the scripts. KWIM. If its bacterial, she should take the med tough. I understand not wanting to give antibioics unnecarrily, but Think about the old days before penicillin and how many babies dies of bacterial infections that developed from sinus infections, bronchitis or other somewhat minor illnesses now...My great uncle died at 13 months due to no antibiotics back then, so antibiotics are a good thing when needed.
Also, when they thought my daugher had a bacterial UTI, she was feverish. I'd get her checked, because yeast and UTI can be common in cloth diapering. I'm not hard core cloth, so I would not have a problem using sposies until the irritation clears up.. Also, read online how to strip and dissenfect your cloth diapers.