I'm very sorry for your loss.
However, it seems you already have your mind made up.
This is a type of confirmation bias. You never once before that feared she might have died? You aren't "forgetting" those times?
It's hardly an amazing coincidence that you felt your grandmother, who was 97, in hospice and as you say, in very ill health, to have died. I'm sorry. Sometimes the mind plays very convincing tricks on you, and yes, sometimes things really are just a coincidence (in this case, not terribly amazing).
All the same, my condolences.

This is a type of confirmation bias. You never once before that feared she might have died? You aren't "forgetting" those times?
It's hardly an amazing coincidence that you felt your grandmother, who was 97, in hospice and as you say, in very ill health, to have died. I'm sorry. Sometimes the mind plays very convincing tricks on you, and yes, sometimes things really are just a coincidence (in this case, not terribly amazing).
All the same, my condolences.
“Eternity is a terrible thought. I mean, where's it going to end?”
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead