What a beautiful story. You had such a nice relations with your grandma. And she was obviously a wise woman. I love the way she was teaching you things. I have never had to grind the wheat but I can imagine it is a never-ending and painful process :) But it's good to learn the hard way and then use the equipment/technology/or whatever else is needed for the process.
I also lived with my grandma when I was between 6 months and 2 years. At that time there were no kindergardens for such small kids and my mom had to work so I lived there during the weekdays. I actually don't remember much from that time but I just wanted to say that grandmas would do anything to help their grandchildren :) It's such a special bond..
Thank you for sharing your beautiful story!