Do shy girls avoid their crushes or become open up to them?

Anonymous
It's more of a general question. I'm wondering because there's this girl who only talks to about 2-3 guys including me and is overall a quiet person. I was surprised when she approached me to ask me a math question a couple of months ago. From there, we've become closer. I have no idea whether or not it's friends or more than friends because I've never been in a situation with a shy girl. She gave me her number and when I asked her to coffee, she said yes. But is it as friends or is she interested? I have no idea. She would almost never start a conversation but would always smile when we bump into each other and is completely open in communication... if I start it. Like I said, I'm the only guy she really talks to, so I'm a bit confused.

So guys and girls, when a shy girl has a crush, do they become more nervous (not the case in my situation) or do they open up? Thanks.
Do shy girls avoid their crushes or become open up to them?
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