DY: You’re being absurd. If your Rav was part of a minority who hold something is Assur, how would you react if I told you that you shouldn’t listen to your Rav because you know he’s outvoted? You’re doing the same thing.
I think the switch is an Issur D’Oraisa, personally. But you can’t tell me that there aren’t any Poskim who are Mattir it. There are, including several prominent Sephardi ones. So if her Rav holds like the Mekilim, who are you to tell her to ignore them?