I am sorry to hear about your mother. Both my mother and father benefited from Hospice care during their final days. My mother had Alzheimers and died in a nursing home and hospice was a comfort to my father and me during the two and a half years she was there. (My mother was beyond caring). A few years later my father had hospice care at home. (He had cancer and dementia and by then I was living with him)
Before hospice my father was in excruciating pain. Within 24 hours under their care he was pain free. At the time, hospice required a doctor's opinion that a patient had less than six months to live and my dad's very nice doctor signed off on it. The Hospice team included a chaplain, a social worker and a nurse who came to the house. The nurse made sure my dad was comfortable and addressed any medical problems. The social worker and chaplain were my support in a very difficult time and I don't know what I would have done without them.
I will be forever grateful to Hospice for being there for me and my family.
My thoughts are with you.
the rules change in different areas and different organizations, in my area it must be a year to live or less, that being said sometimes the person dies sooner, and sometimes they die several years later (like I heard of one whom had hospice for 6 years and finnaly died of something else).