Why would a good-looking girl look up and away from someone walking in the opposite direction she is walking?

suctioncup
I know the girl from another class but not sure why she did that lol.

I think she saw me coming with the corner of her eye and when she saw me walking in the opposite direction she quickly looked up and completely away from me (kinda like if she was looking at the sky). when we passed by each other she quickly looked at me at the very last second and said hi with a big fake smile.

Im not sure if she did that last thing just out of politeness or what?

I think she just wanted to see if i was looking at her and because we made eye contact she had to say hi?

what do you think?
Why would a good-looking girl look up and away from someone walking in the opposite direction she is walking?
2 Opinion