hi there, hematuria
or blood in urine could result from any cause affecting anywhere in the genitourinary system begining from the kidney
to the urethra
. As she does not have any organic reason which can be detected on routine screening it is best to consult the nephrologist
who will try and determine the cause of hematuria and treat it accordingly.Unexplained hematuria is not to be taken lightly and should be resolved by specialist.Do not be worried but sure be concerned till you are able to find the cause of hematuria. Take care.