According to your information, it may be Urinary Tract Infection
(UTI) or Bladder infection. One urine culture test will be worthwhile to confirm the diagnosis.
PREVENTION: She needs to take one short course of antibiotic along with URINE ALKALISER. In addition, you must drink plenty of water (2.5 to 3 lit/ day), take cranberry juice regularly, maintain genital hygiene (during sexual activity also), empty bladder in time, avoid unprotected sex (if sexually active) and wear clean-cotton underwear only.