It might be therapeutic for you and your daughter to talk about the revenge scenarios that have been mentioned (plus a few that both you and she have envisioned privately).
If she has e-mails from him or any other incriminating evidence, it might be fun to make copies of everything and send it to him, just so he knows that the evidence exists. That in itself will haunt him for a long time, wondering when/if it will ever surface to the elders (if he is, in fact, trying to get reinstated, which seems highly doubtful IMO, but is a convenient "escape clause" for him).
Talking about revenge scenarios doesn't mean that anyone has to act on them. The idea is to VENT the hurt and the anger in a controlled way and get it all out of her system, in order to be free of all the crap he put her through before moving on to the next relationship.
Yes, he did 'lead her down the garden path'. Yes, he took advantage of her trust and the history they shared. Yes, he deserves to have his balls cut off and handed to him at a meeting of a Judicial Committee. He is a manipulative loser. She may not feel this way right now, but she's very lucky to have learned that about him as quickly as she did. She will be on the lookout for red flags in the future.
Give her a big hug for me.
Love, Scully