Maybe concentrate on the primal things she already likes. If she can increase those and decrease the nonprimal things, it's a start.
Also, if she's carrying around 30 extra pounds, maybe don't push the fat thing. If she's eating meat, dairy, and butter, she's getting fat, plus she has some to draw from. Some women don't do well on the 70% fat thing. As long as she's not doing the CW nonfat way of life, she'll get fat in her foods.
Kudos to you for helping Grandma! I loved mine to pieces.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine