I'd suggest that regardless of whatever your friend does she forgive him and not take any of it to heart but rather have pity on him. After all, he is the one in such a sad state that he'd treat his own wife so poorly. What does this say about him, really?
Ideally, it would be good to resolve the conflict and heal the wounds through Pastoral counseling but that may or may not be possible and with any wound it may leave a scar. Ultimately, it's up to the two of them and is a very huge undertaking which will require a lot of work and patience.
Beyond that, she could try the gut punch, You know the old saying, \"When in doubt knock the sucka out...\". :p
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