hello chersmateo. Welcome to HCM.
. the causes may be many such as: kidney damage, tumors which erode the urinary tract
anywhere along its length, kidney trauma, urinary stones, renal infarcts, acute tubular necrosis
, upper and lower urinary tract infections, nephrotoxins, and physical stress
Also this is usually asscoiated with urinary infection, such pain, burning sensation while urinating and often need to urinate are typical signs of it.
So she needt to do urine analysis and uro ultrasound
. Till that she can dring some of teas made for ureteral stones and lot of fluids.
Hope I have answered your query. If you have any further questions I will be happy to help