You daughter has traces on blood in her urine? Some amount of blood is normal, but conditions are not always treatable with antibiotics. It is also possible to miss problems with a scan. There are too many reasons to list why she might have this recurring problem.

Here is a site where you can browse the different causes. I would suggest going to a different doctor and getting a second opinion, or at least getting some blood work done.

http://www.wrongdiagnosis.com/sym/blood_in _urine.htm