It can be very scary to recommend a diet for someone else! Especially if they have other health conditions.
I have seen many, many people on this forum who had great success reversing Type 2 diabetes with a primal diet. Personally I have had amazing success improving arthritis and severe bowel issues as well. Diverticulitis patients may need to avoid nuts and seeds on the primal diet, but other than that I can't see how it could hurt.
I think that primal eating could very well improve her life dramatically and I really doubt that it could hurt her. If she is open, maybe get her a book or two or show her some websites and let her decide herself?