I added girl on Facebook, but she doesn't talk to me, why?

[Hyrule]

First, i created a forum on the student room trying to create a group of friends that are going to the same university as i am for pharmacy. A couple of people did reply, but this one female member exchanged messages with me the most. We actually talked a lot! Then eventually she added me on Facebook. I accepted. But before that, i was REALLY NERVOUS whether I should accept or not because I have a condition called achondroplasia, pretty much, i look like a dwarf, small, big head, ugly. I was afraid that she would see my photos and get a totally different impression of me. I told a couple of my friends about it and they told me to "shut up and just go ahead, people like that who
judge me on my appearance are weirdos" and so i accepted, and then i carried on the convo we had from thestudentroom, just the same way we did before, and she didn't reply, and it did deco say that she saw my message and she was online.
I am not saying that i had an interest in her, i just want to know why isnt she talking to me. Do you guys think what i was afraid of was correct. Cause now, if either of us wants to unfriend each other, it would be bloody awkward if we meet in the uni hall