Could I take legal action against this person?

[PMC]

OK, so you deleted and blocked her....did you also block all of her friends? Just because she can't see your profile that doesn't mean that others in her little group can't unless you block them too. Here's what you do, deactivate your current profile, create a new email address and start completely over with a new Facebook profile. Make sure in your preferences that people can't see anything on that profile and that they cannot find you with a basic search. Add only those friends from your old profile that you trust but also make your entire friends list only visible to you. You can also make it so only you can see posts to your timeline, that's up to you. This may solve part of the symptom but it may take a call to this girls parents to cure the disease.