I noticed that a lot of your items have awards, so I wondered if I should go ahead and review a piece of yours or not, but this one - well, when I opened it I found that it was a winning Contest entry, too - but I decided to read it even so. So my choice was a bit of an erratic 'Moment'. I think the whole idea of recording a 'Book of Moments' is very appealing and wondered if that was part of the prompt.
You relate a loving portrayal of a grandmother. It's a tale illuminating two ends of the human age-scale, well-structured with the neat way you return to gather up the book of moments right at the end.
There are some striking images which I particularly liked, this is one of them: 'She was the flagstone to my crazy paving.'
There were no grammatical or other errors or any other untoward distractions.
My only caveat would be that your immediate reaction to her death seemed a little cold, considering how close and dependent you had been. You make a reference to this within the story: "it was my pain that seemed to be muted". You miss your absent parents every day but maybe it is your own maturity which enables you to accept your grandmother's death more easily.
In any event it is a moving account of a loving relationship and I appreciated the opportunity to read it.