Hello. You should know that female urethra is close to anal canal and it is also short compared to males, so chances of reinfection is high in females. Maintaing a clean hygiene is very important in preventing the reinfection. Drink plenty of water to get rid of bacteria setteled in the urethra or bladder.avoid wearing tight pants, since excessive sweating will act as a breeding site for bacteria.whenever you feel there is a need to go for toilet try to avoid holding it back but avoid public toilets or unclean places which can serve as a source of bacteria for reinfections.sometimes a kidney stone impaction can result in recurrent infection.Injury to back bone can cause neurogenic bladder dysfunction.sometimes this might be psychological so try to destress by doing meditation and yoga on regular basis. If possible kindly consult a urologist for further management.