Foods. Google 'diabetes nutrition' for suggestions. Google 'healthy heart foods' for more.
Medication. We are not privy to your mother's medical records, her glucose levels, nor have you mentioned if she is a type 1, type 1.5 or type 2 diabetic. You should be talking with her doctor about medication.
Go here for drug interactions http://www.drugs.com/drug_interactions.html
And, avoid fad diets.
Does the mayo clinic recommend the grapefruit diet?
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haddin
mayo clinic grapefruit diet
Vinegar, pickles & see a dr. I use the pickles after a large meal. There are a few meds out there that are safe to use with high BP so don't sweat that but deffinately GET HER TO A DOCTOR!!