Recurring Bladder Infections

  My 7 year old daughter is having recurring bladder infections.  This has been happening for 5 years, coincidentally after falling and rupturing her hyman.  She has been on several different antibiotics and her body has built a resistance to them or she has developed an allergic reaction to them.  Her physician is at a loss as to what to do.  At this point he wants to admit her to the hospital and do IV antibiotics but he says this will not cure it only hopefully prolong until the next infection.  I realize little girls are prone to bladder infection and she previously had Reflux but they have since said she outgrew it but the infection still keep coming.  She can only be off antibiotics about 7 days before getting another although the one she has now she was still on antibiotics (Furadantin).  This is the second infection on this one.  What can we do for her?  What should our doctor check for or what is the next step for us?  Thank you.
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Dear Lisa:
Urinary tract infections (UTI) are more common in girls than boys.  The combination of UTIs and reflux, however, can be dangerous in children due to the reflux of infected urine into the kidneys that leads to pyelonephritis.  Pyelonephritis is particularly a problem in children because in the process of healing the involved portion of the kidney scars and leads to nonfunction of that segment  Because children