I’ve been with three people as/just before they died. All were quite different experiences.
My grandad was in his 90s, and had gradually declined over about 3 years. We got a call to go, as they thought it was imminent. He held on for about another 8 or 9 hours after we arrived. My cousins, my mum and my uncle were all there. We talked about memories, and funny/happy family times. It was sad, of course, but not tragic. we hope that he heard some of it. He took some increasingly rattling breaths, and then went.
My uncle had cancer. It was fucking horrific, I have to say. He was hallucinating, and like an emaciated skeleton. My mum and I seriously considered putting a pillow over his face the night before he died (sorry to say), as we couldn’t bear for him to be in that state. He spent one night calling for his wife, who had died 25 years previously, and after that wasn’t really lucid.
My best friend’s mum died in hospital from a serious respiratory illness which went downhill very quickly. We were there pretty much constantly for 3 days. The last day, we left to get something to eat, and some air. She wanted 5 mins alone with her mum (of course) and told her it was ok to go…. We got a call about 20 mins later saying that we should come back. By the time we got there (I think I probably jumped lights, sped, the lot) she had gone. I think she was waiting for us to go… again, I hope she heard that her daughter had a fierce support network.
Personally, I’m an atheist, who is obviously dead inside, but I think the sting hear/understand more than we think. The best we can do is to tell them that we love them, and we’ll survive (in a positive way) without them.
I’m so sorry to hear about your mum, OP. I hope that she has a peaceful end, and that you have good support. Xx