Thinking of your friend who has been struggling with these issues.
It's 30 years now since there have been women canonical judges in the USA, but I must say I'd be temperamentally unfit to be on a Marriage Tribunal. On the one hand, I am absolutely committed to the Church's doctrine that a valid marriage creates a sacred bond in the eyes of God which endures until death. On the other hand, the emotions in hard cases would either sway me or make me recuse myself from the case to avoid being swayed.
"Suffering and sacrifice" and even "Fidelity to a vow" are not words anybody wants to hear. But one has to be ready to even die in defense of the vow.