Here is a recent book on the topic by Dr. Joel Fuhrman: "The End of Diabetes: The Eat to Live Plan to Prevent and Reverse Diabetes".

A more general book with good advice on nutrition that is perhaps easier to follow -- but not specific to diabetes -- is "The Whole Foods Diet: The Lifesaving Plan for Health and Longevity" by John Mackey , Alona Pulde, and Matthew Lederman.

Good luck to you and your mom! It helps a lot in making lifestyle changes when family, friends, and neighbors are supportive. See also the book "The Blue Zones of Happiness: Lessons From the World's Happiest People" for a bigger picture view on that.

Good sleep is another part of the puzzle -- see Matthew Walker's book "Why We Sleep: Unlocking the Power of Sleep and Dreams" on that. Essentially, good sleep gives you better self-control during the day -- as well as helping your health in many ways including regarding diabetes.

Basic principle is to try to build new habits of how we eat gradually changing only 1 or 2 things every week and re-enforcing what works/cutting what doesn't. Typical diets (in my community) are 70 percent carbs, 30 percent veggies. We started by basically reversing this ratio. We also completely eliminated sugar & processed carbs (ie. flour - basically no breads & only whole grains) - but apart from this, I didn't fundamentally change what I ate. Then we progressively started reducing eating window over 10-12 weeks to < 6 hours in a day and started adding 2/3 day fasts. However, there are many routes & it works best if customized to individual.

keep it simple..Start with cutting out processed sugars and carbs/bread/rice.

Maybe sub with alcohol sugars if needed.