You have given a very sketchy picture for me to give you a reasonable explanation. This is probably because you are in different countries and i understand. From what i can make out, the doctors must have found masses in one or both ovaries and thought that it was ovarian cancer
and operated upon her. During or after the operation they found out that the masses in the ovaries were not due to ovarian cancer but due to pancreatic cancer spreading to the ovaries. Also, there was fluid in her abdomen which means that the cancer had already spread to other parts of the abdomen. Presently she probably has a drain tube in the side which keeps draining this fluid. If this is the correct picture then i am afraid to say, but your mother is suffering from last stage pancreatic cancer which has an extremely poor prognosis and a survival ranging in months. The only treatment option is chemotherapy
and that too is palliative. If however i am not correct in my assumptions or if you are not sure , then i suggest you get some more facts before reaching a conclusion. Hope this helps.