My grandmother has ovarian canver but don't know what stage. is this treatable?

Yes but . . .: Without knowing the stage (much less her overall current health, lifestyle & family history), we can't quantify how treatable. So it's best to ask a family member or close friend to provide a second pair of ears by accompanying your grandma to each of her appointments. Be sure to bring all her medications (from all her docs) plus all her over-the-counter stuff, too, to each visit.