What does it mean when a girl initiates conversations with a guy she knows and STILL seems nervous?

Anonymous
Does that make sense? She knows me and I usually wait for her to start a conversation or joke with me (which she usually does) but after the fact she still looks nervous, doesn't look at me that much, plays with her phone or seems "busy" doing something else.

If she goes to the trouble of initiating and knows me, what's with being a nervous wreck and aloof? isn't initiating the opposite of being nervous?
What does it mean when a girl initiates conversations with a guy she knows and STILL seems nervous?
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