I think that may be the best you can do. Since she isn't posting anymore it won't come up again.
I guess if you were really worried you could email her using her member profile addy and just offer to help if you can, maybe find out where she lives.

Then maybe local authorities
I'm not sure what she said or if you want to get in that far though, I think reporting it to her ISP is a very good thing to do though.