Some people have all the symptoms of UTI, and some can have a uti and have no symptoms. Typically any of these 'may' be present:
foul odor to urine, burning, a need to urinate, not being able to make it on time before it comes out, urgency, not being able to completely empty bladder, stomach aches, back aches,rashes on hips or genital area, ..and when a fever/excessive sleepiness starts...it means it has moved up into kidneys and has become serious.
Another common cause of excessive urination is when a person has a high sodium state in the body (alkalosis). These people will eventually get diabetes and frequesnt urination and thirst is a definite early warning sign. Another cause of frequent urination might be high calcium levels ( I am trying to remember as I do medical research). High milk intake can cause high calcium levels (milk alkali syndrome). Night bedwetting in children points to perhaps diabetic/kidney issues down the road when an adult. Sodas or coffee will cause more urination, so will some prescription drug side affects.
I would take her in for a CBC and a glucose tolerance test, A1C test..
Go to "rightdiagnosis.com' and type in 'polyurea'.