I would not wait. CA125 is not always a reliable indicator because other things can affect it, which is why it's not used as a screening test for ovca. When will she get her insurance? If it were me I would go see a gyn oncologist immediately. If this is ovca, and it may not be, time is very important. A couple of weeks may not make a difference but I wouldn't take a chance.
Good luck to you and your sister.
JC145 is absolutely right, and have her take all the test results to the new doctor. They can't make an intelligent analysis without knowing what was found. Good luck.
She should see ANY doctor a.s.a.p. A primary care doctor, a free clinic doctor, an e.r. doctor ... and see where it goes from there. Someone should be checking the weight gain, etc.