LOL.........matter of opinion here.
Her atrial fibrillation is almost certainly secondary to her hypertension (High Blood pressure).
So the question is........is her BP of around 140/72 low enough ?
Depends who you ask......if you ask a Cardiologist, he would say, that it is still not low enough........if you ask sqad, he will say, that it IS low enough and no added hypotensive drugs needed.
Ramipril is a standard addition and a reasonable shout, if your friend wants to go down that route.
I understand your description of "overkill" of which I have some sympathy .
My advice is to take the Ramipril addition and see how it goes......if she gets side effects then she can stop taking it.
That is my opinion.