R.S.
Perhaps it may be worth a trip to the doctor. As my experience as a nurse tells me, she is exhibiting possible symtpoms of a urinary problem. If you have not already done so, have her increase her fluids until she is examined by a doctor, no caffeine. There are over the counter products that may help if she has burning or stinging, but if it is a urinary tract infection these products wont get rid of the infection, however antibiotics will.
Hope this helps.