The only wish for Grandma I have was that she enjoyed her life more when I knew her. Unlike most people my age/generation, my grandparents were almost a generation older than everybody else’s. By the time my memory kicked in, Grandma was retired from teaching and oddly she didn’t enjoy the life she had afterward. Not everything was unpleasant. I think the issue was a general cluelessness about contemporary life, aka the generation gap.
Despite the disagreements, arguments and other negative things, Grandma was a positive factor toward my development. Namely for providing the drive and later on, the means to earn a university education. There were numerous matters to be grateful for but my educational level is the biggest.
It would be nice to have a time machine. Then I could meet a younger, more coherent version of Grandma. Say thanks and have an adult discussion. Not an adult to grandchild level conversation or young adult to terminally ill person talk.