After A Total Hysterectomy, A Mass Was Identified Between The

After a total hysterectomy, a mass was identified between the rectum & bladder. My sister had a recent bout with severe lower abdominal pain (relieved w/high advil doses), nausea, diarrhea, bloating & thus could not eat but back to eating fine now. A CT later identified a mass. Went to Gyn/Onc to have a CA125 marker test, then scheduled a proctoscopy/cytoscopy for later this week then a biopsy soon after.
Yes it is scarry as depending upon what is further identified, there is a potential of a colostomy needs due to the location.
What other questions should we ask the Gyn/Onc or radiologist soon?