Why did this girl from my class block me on Facebook?

[Sunshine on a Cloudy Day]

So there's this girl from my Accounting class on Facebook. She liked my post on my school's Facebook page about my schedule and said we have Accounting together.

So I friend requested her & she accepted. I introduced myself.
That was a while back.

Just a few days ago, she asked me for help with Accounting homework and I TRIED to help her.

I don't know how successful I was (she replied ''lol okay sheesh then'').

And now I was scrolling through something on my Feed I think and looked at its ''likes'' and realized she deleted me!!!

Right after I re-requested her, I realized she blocked me because I went back to my inbox, saw that her profile picture is still there, but that I CANNOT click on her name.

I also asked a friend, and yep, she blocked me!!!!

Why might have this girl blocked me, honestly?

I also scrolled through my stuff and never posted anything offensive!!!
Just fun stuff!!!

I know this shouldn't matter much because I've never actually seen this girl in person, but she's a classmate, and I'm someone who gets upset easily!!!