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Cardiomegaly isn't a disease in itself, but the result of some other process. Cardiomegaly means "large heart", so her heart is enlargedEnlarged adenoids Enlarged prostate. This could be from any number of causes, and I would want to know more about what those possible causes are. She has every right to know this, and to ask questions about it.
As for the diet, I find it very confusing. I can't get my head around no iron and no fiber, and I'd be asking why and also for a second opinion - if only from a certified nutritionist.
The appropriate diet would depend solely on the cause of your grandmother's enlarged heart.