My mom has high uric acid, diabetes, heart, blood pres. she wants to know why it's caused. provide meal plan she does not eat meat or fish. what else?

Overweight?: Your mom's diagnoses often go together with overweight, which can cause each of them. I would recommend a calorie restricted diet, with particular attention paid to avoiding high glycemic foods, like potatoes, bread, rice, sugar, cakes etc. Daily exercise would be important too, aiming for 45 minutes each day, aiming to get a little short of breath and sweaty. Hopefully things improve soon.