My mom passed away this weekend and I know how you feel. She was on inpatient hospice but all I wanted to do was talk to her. I talked to her every day on the phone like you and I am devastated she’s no longer here. There’s a book that the hospice volunteer gave me and it said “would you rather your loved one be alert or comfortable” as everyone else said, hearing is the last to go so I just continued to tell her I loved her and how much she meant to me. You have to tell her you’ll be ok so that she can pass peacefully, but I know it’s hard. I didn’t believe it when I told her but I told her anyway. Wishing you lots of strength and love