As horrible as it is, there is one positive thing about it, and I hope you are not offended by me saying it. Your mom has the chance to take care of some things and you have the chance to say goodbye. My mother just up and died one day for some reason that we will never know and was all alone. You can use the time you have left to make sure that the things you want to say and thay the things she may want to say to you get said. I surely hope that she goes with no suffering.