Good that her mood is better. I'd go with throwing away the tools once, but if she finds more then leave it and let her keep them. Of course don't tell her this, but tell her your throwing away her tools this time. Is she on any medication? Or councilling? she sounds like she still needs help. IF they haven't given her any, I'd push for it, even if she seems ok now, as it can take time on waiting lists.
The website sounds really nasty, I've heard of those and they are nothing but bad new. Definitely block it, it's only encouraging her to hurt herself. Perhaps suggest this site to her? much better for support
I guess she needed a place where people could understand her, which that was, but this also is but much better as we kinda encourage to stop.
You may be removing her control once, but it's only once. And she is then given the freedom and choice if she wants to pick it up again, or get better.
Keep a close eye on her. Don't remove her privacy or anything, but make sure you are around as much as you can be, and always there for her. Don't be afraid to ask her how she is feeling, and give lots of hugs.