She Will Only Text - Never call

I know a girl who I am quite friendly with. We are just friends now but am trying to change that because I really like her.

Can an intelligent woman tell me why this girl will NEVER call? She will always immediately return texts but will rarely, if ever, return a phone call. I believe in the year I've known her she has only called me maybe 3 times. Again, if I text her she will always respond. If I call she will respond but only with a text. Also when I see her I always have to be the one to approach her. She is very friendly (and usually gives sexual innuendos) but will never make the first move.

So why will she only text and why avoidance when she sees me. Again, when I am with her we are great together and she drops hints on sex all the time. Why only texting? I know she does not have a boy friend or seeing anyone.
She Will Only Text - Never call
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