Girls, This shy girl that likes me acts so weird/distant today and I'm confused what does her behavior mean?

Anonymous
So there's a shy introverted girl i like (she and i like each other for 3 years back and forth). When this semester started in a period of 3 weeks she showed the signs that she likes me but was nervous/shy/awkard as she acts different around me to others. She would freeze up around me and not say too much but this happens:
-I saw her at my campus bus stop and she looked over and said hi and smiled as i did the same but she had her headphones so i didn't disturb her.
-We get on the bus but i couldnt sit next to her so we got off at the same stop and I start to talk to her. I noticed she touched her hair.
-Talking to her she was very quiet and barely said anything as it was awkward and she seemed a little mad.
-I asked her out for coffee by saying we should catch up sometime and she said yeah so i said would you wwant to grab coffee casually and she said yeah, I've been busy lately with school and homework and I said i totally understand but well talk soon and I left to go to my car and after she stared at me and touched her hair and left.
Why is she like this?
Girls, This shy girl that likes me acts so weird/distant today and I'm confused what does her behavior mean?
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