Very confusing, only had one answer last time. More please.?

Well there is a girl that is always so quiet to me, let me rephrase that. We are both so quiet when we talk together. I thought it was because she hated me but I asked her that and she said no. So then I told her that I don't understand why we are so quiet when we talk together. She just smiled and giggled a little bit and said "yea." Any reason why she's so shy around me but she can talk to everybody else just fine! Then after a while of the same thing, she started to look at me a lot a couple days ago and when she looked at me she covered her head with her arms and "cuddle" on her friends shoulders. Well I asked the girl I like if everyhing was fine and she said yes, and I told her about what she did and she lied saying "no, I didn't do that". Well yesterday she looked at me but didn't do the cuddle hide thing, well today she did it again. Then I asked one of her friends if she was mad at me and her friend said "I don't think so." Well then I told her that she was hiding when I was walking passed and the friend said "Haha, I don't think she's mad at you she's just weird." What's going on with the girl I like?