Girl's Behavior

Girl acting funny/strange?

Hello I am wondering why this girl acts kinda weird around me. I am kinda shy and really busy so I don't do many things socially, so I kind of need to ask this question. Im socially inept sometimes :/ Basically there is this girl, lets call her Sara. I have never spoken to Sara, because I have never really had time or a reason to. She lives in a dorm with me.

One day I was in the kitchen minding my own business and I turn around and she is looking at me in the eyes and smiles. I smile back and continue cooking. This was my first interaction with her. I thought why did she do this? Another time she walked by in the hall way and I looked up and she was looking at my eyes for a few seconds. I looked away immediately because I thought why is she staring at me. Another time I held open the door and she smiled at me while looking into my eyes. Today I saw her and we locked eyes but she immediately looked away. I have never spoken to her. I asked her friend about her and told her what I was thinking, that she seemed friendly. Her friend thinks I like her or something, its true I think she is extremely pretty, but I don't know her so I can't say for sure that I like her.

Basically I am just wondering why she is acting like this around me. She seems friendly, but isn't coming up to talk to me. I am not sure what to think but any advice would be nice.

TLDR: Girl keeps making eye contact and smiles. Today she made eye contact and immediately looked away. Seems friendly, but isn't talking to me. Why is she acting this way. Is this weird?

Girl acting funny/strange?
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