DR Danise, I think you did the right thing for the moment with your mother. The people at hospice should have booklets on the dying process and you should read them for the imminent signs: the fingernails turn white, she'll drift further out of consciousness, and there are more things I don't remember. Once she's settled into hospice, I recommend that you sit with her, hold her hand, and talk to her. Tell her how much you love her, and let her know that she has your permission to go. Don't beg her to stay, tell her to go with the light and find peace.
It killed me to do it, and I said this to my dad for two days in February. I believe he needed this assurance. I told him if my mom came for him to follow her, and I believe she was in the room with him and waiting for him. I hope the end is quick for her and for you.