Ovarian-Cyst.org

The sign and symptoms of ovarian cancer is difficult to find out because ovarian cancer does not have any symptoms in its early stages. The ovaries lie deep within the pelvis, which is why early tumors are hard for even skilled doctors to find.
This is the reason that only 25% of ovarian cancers are found at an early stage.
Here are mention some symptoms that will surely helpful for your MOM.
•Swelling of the stomach (abdomen)
•Problems such as gas, bloating, long-term stomach pain, or indigestion
•Bleeding between periods or after menopause
•Pelvic pain
•Feeling of pressure in the pelvis
•Leg pain .
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Ovarian cancer does not have symptoms in the beginning and when the person des get symptoms they are nonspecific. They include irregular periods, urinary frequency, constipation, vaginal bleeding, abdominal pain and distention.

They are ill defined and vague. lower abdominal pain, distension and maybe a lump.
If your mother is worried then she need a pelvic ultrasound