Why does my shyness entertain her?

I met this girl at a train ride back home and she saw me listen to my iPad and she was interested in knowing what I was listening to. I let her listen to it and then she began talking to me. She sat next to me and got really close and I blushed. She asked why I was blushing and I said, "Be-because… I mean, I, I mean, it's just that, well, you're…" She giggled at me and I told her I was sorry. She then changed the subject by telling me about herself and asking me questions about myself. She said she felt tired and tried to snuggle up on her seat and I offered myself as a pillow. I told her I was skinny, but I could be of some warmth and I was blushing and she giggled and said I was shy. I stuttered as I tried telling her I wasn't shy. She put her head on my chest and cuddled with me. She looked up and saw I was blushing and she giggled and put her head back down and said I was shy. I stuttered and told her I wasn't shy and she just rubbed her head on my chest, causing me to rub her back and blush even more.

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