Well, part of the problem is the wheedling/harassment/abuse via electronic means.

So just having 'em physically away from each other's not going to stop her from texting him or posting facebook statuses or commenting on his or messaging him on facebook.

Which means I either need to convince him to block her and every other person that has their contact information to refuse to act as proxies for her (easier said than done, what with the social group not having dropped her like she was hot and instead many of them actively encouraging her bad behavior because watching the train wreck is hilarious to them ) or somehow get power over her in order to prevent her from reaching out towards him.