I had both ovaries and my tubes removed due to the discovery of two masses in my ovaries. I don't know why this lady has had so much pain, but perhaps my story can help.
Right after surgery, I was in a moderate amount of pain, but as time went on the pain became worse and worse. After a day of this, I got the feeling that perhaps the pain was related to having gas. They have to pump air into your incision to see what they are doing, and I was unable to expel this air (this is a polite way of saying "fart"). The doctors encouraged me to walk around the hospital floor and then I would be able to fart. That didn't work and as I got back to my room, I remembered that this had ocurred to me once before, and I had bent over thinking that might help me fart. I bent over, and sure enough, the air was expelled.
So, I bent over my hospital bed, and what do you know? The floodgates opened. I had to beg the forgiveness of my roommate, but now that I had they answer, I bent over whenever I felt the pain coming back. I don't know if your pain is the result of having unexpelled gas, but try my method. After a while, I found that I had to sort of pump my body by standing erect, then bending over several times. Almost any position can do it. I also tried leaning over to my left and right, and that helped too.
I had been encouraged to have my ovaries removed over a year ago, because I had the BRCA1 gene. I am very sorry now that I didn't do it then, because now I have ovarian cancer, and the doctors have found that the cancer may have spread to two other organs. As you know, ovarian cancer does not have a good prognosis. Please tell your sister to have the surgery now, before she develops this terrible cancer. I know she may be scared by how much pain you are having, but that does not compare to the risk of developing ovarian cancer.