Since you know her I am going to suggest you attack the NC from BOTH ends... Tell HER not to contact HIM .. EVER...
Make it clear she's done a lot of damage and you will not put up with it anymore...
This is a test ... if she fights you on it.. you KNOW she's goign to be pushing him... if she surrenders... well then you know you need to watch him closely... either way... confronting her to NC as well I think is a help in this case...
Normally I would'nt reccomend it, but in your case I would suggest you attack from both ends.
