If a girl is usually talkative, but shy around you only, what does it mean?

She's very outgoing and talkative with everyone, except for me. I said a simple "hey" to her and she turned in the opposite direction. When I'm talking to someone near her, she also turns away. What does this mean? She's talkative with everyone else.
If a girl is usually talkative, but shy around you only, what does it mean?
Post Opinion