Hi Zola, very nice memories and narrative of your Grandmother. You have a wonderful skill at writing descriptive narrative and that makes the reader very engaged. I like that you include both your memories and your research, but I wonder if there is some way to mesh the two. There seems to be a clear line between the two and I wonder if you've considered restructuring. It feels very divided. Perhaps there some way of blending them. Just a thought. Very nice work on adding dialogue into your narrative!!
I think the only part that seems out of place are the series of questions you insert on your Grandmother's death. You can certainly elude to all your unanswered questions but I'm not sure it's necessary to list them all.
Since you mention Ian Frazier, you may want to read Inventing the Truth, The Art and Craft of Memoir. Ian Frazier has a chapter in this book, he discusses his approach to writing his book Family. Every chapter is written by a different nonfiction writer including Frank McCourt, Annie Dillard, Henry Louis Gates Jr. and it is edited by William Zinsser. A wonderful book for those wishing to learn from some of the greats.
Zola, really nicely done, I'm excited to see how your writing will develop over time.