Hello ma'am and welcome.
This could be a number of things but due to the fact that you have mentioned the absence of pelvic organs (which means she has most probably undergone a hysterectomy
) I would think this has to do with a possible urinary tract infection
, or a few other common causes.
Please take her to a doctor who may request for a urine examination, ultrasound
examination of the region, physical examination, and so on.
Hope this helps.