Yes another one, but this one honestly has me puzzled.

This girl who asked me out once, messages me all the time on Facebook, but hardly talks to me in real life.
Like its everyday and semi flirtatious, but always about mundane things. :/
When I see her in school she ignores me and won't even acknowledge me. I just don't get it. Why?
I like her, but...
When I was in elementary school this is something that I did.
I was just ultra shy and nervous when it came to a girlfriend back then. I was completely fine with them up until it turned out we were dating and I became skittish.
It sounds like she's super shy too. On Facebook, while already in conversation, kind of slide into asking her about it. Don't be blatant or bold when asking because you'll never get the truth or probably even an answer.
However, this was back when I was in elementary school. What grade are you in now? Because it most likely shouldn't be happening anymore.