Whats the life expectancy for Ovarian Cancer?

My mother was just told she has this, After 2 years of complaining of symtoms to her family doctor. He always blew it off as Menopause and never ordered any test. She went to another doctor for something totally unrelated and was sent for a battery of test. She has stage 2 cancer and is now undergoing surgery next week. I am her daughter and I'm freaking out in all directions, and trying to stay calm and collected around her. I just need any help in this department, thank you all so much.