Am I interpreting this correctly?

[BitleeVocella]

I'm in 10th grade and I've never dated in my life. I am an overweight nerd and enjoy arguing with people. Most people tend to just look past me. So in English class I sit behind a girl, she is out of my league and is dating someone else. She constantly leans back and plays with her hair in my face. I know she's doing it on purpose because she looks back and acknowledges it afterwards. It's usually followed by a random conversation. Is she doing the hair thing just to annoy me or is their a possibility that she knows I have a hair fetish and is trying to send me signals? I would say I've only told about 6 people about the fetish but I don't know how fast that stuff spreads, but this is all a pretty major leap and I feel like I may just be jumping to conclusions considering how lonely I secretly am. Do you people think shes just messing with me or that there is some deeper meaning to it?

[Swagging god]

Hard to tell flirt back and see or just ask her if she likes you

[Living For Love]

I don't think you can conclude that she's into you only because she does that, but I think you can give it a try. She's already dating someone else, so you can't do nothing, but hey, it doesn't mean you can't be her friend. Get a bit close to her, start conversations. You wouldn't feel so lonely, and maybe she also wants to be your friend, as she has probably already realised you are a bit alone.

[Menzis]

There's too little signs to interprete this as flirting according to me, but see if more signs come your way and try to flirt back.

[Nyan-Katharine]

Protip: there is no such thing as "out of your league". There is no league. Also, nerds are cute. Don't think of that as a bad quality. EMBRACE THE NERD!

She is maybe just being friendly, or joking around. And anything about any kind of fetish is most likely going to spread like wildfire I'm afraid, so maybe she's heard about that. If she's in a relationship, I'd say it's a no go area. (Believe me, you don't want to go there.)

But hey, if she becomes single at any point, ask her out on a date! Maybe not even that, just ask if she wants to have lunch with you one day. Worked for me!