i know people are saying dont do it,. but i say follow through on it with the polices help and supervision, have her set up a meet with X person IF she is willing to do it, who knows, this person could be harrassing alot of women.
They already know all there is to know about her, meeting in person in a public place seems to the the ONLY sure fire way to nail this sucker, give her a small can of mace to take with her as well just in case, or a zapper, they meet, she then says "excuse me just have to use the washroom" cops come in bam , done deal.