Only asking as it would be helpful for others.
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.
Maybe sub with alcohol sugars if needed.
Well in the last 3 months, I DID learn new eating habits, lost 15 kilos and had my meds cut from 6.5 tablets per day to 0.5 tablets a day working with a doctor and having good control on blood sugar. The big AHA is that progressive changes have to be made in how you eat rather than necessarily so much in what you eat.
In general, unless you have significant beta cell death already, it IS possible to mitigate or reverse effects of type 2 diabetes and this is vastly preferable to pushing organs beyond limits through drugs or insulin.