Arthur, personally I have no idea about that.
I think the best strategy is to have Myrna re-acquire her Philippine Citizenship.
It's very straightforward. The ceremony is about 15-20 mins only (unless it's changed) and the cost is really quite small.
You could always check out with a lawyer, but to be honest, I think there are much less twists and turns when being a Philippine Citizen.
Just my opinion