When the time comes, and you will know,
hospice is a good answer, let her be free
of pain and able to enjoy her time with her family and friends. It is not easy to give up, but if the quality of life is gone, then you need to think about what would give her some peace. From one that has been there, I am so sorry about your mother, but this is for you also, it is very hard to be the caregiver at the end of a loved ones life.