Am I able to file harassment charges for this?

[David S]

She's an emotionally upset, immature high school girl. Her behavior is a reflection of that. I don't think anything she's done has risen to the level harassment as defined by law, but if you want to start making her uncomfortable (which frankly, will only make matters worse and take up a lot more of your time), call the police non-emergency number, usually 311, and make a report.

She can control your life only if you allow it. Disconnect from social media for a while, block her across all of your communications, and then go about your business. You'll learn someday that some things are simply not worth the aggravation.