Well…
IC interstitial cystitis which @casheroo mentioned, can cause symptoms identical to a bladder infection, without any bacteria involved. Certain foods and drinks can bring on IC symptoms, especially acidic foods, spicy foods, caffeine and artificial sweeteners.
Passing a small stone can also cause UTI symtoms – a larger stone will cause flank pain and obvious blood in the urine as well as the burning and urgency. Once the stone is passed, symptoms subside.
Antibiotics can be miracle drugs, but they are not without risk. There’s always the possibility of an allergic reaction, even with an antibiotic you’ve taken before. Antibiotics also wipe out friendly bacteria along with the bad ones.
I have seen women recover from mild UTI symptoms through pushing fluids and using cranberry concentrate – if that’s what she’s been doing, I would keep it up for another couple days and stay alert for any return of symptoms. Get seen ASAP if symptoms come back.
If she’s been using the AZO, don’t trust the symptom relief – it’s not a treatment for infection, only for pain. Go get checked out.