Chief, I'm sorry, I don't think I know how old you are, and that makes a difference, I think.
But, if you're old enough to drive (whether you do or not), then just ask her out. If she doesn't like you that much, she'll say, "No, thank you." or "I'm sorry, I'm already doing something that evening."
If she's already dating someone else, she'll say, "How nice of you to ask, but I'm so-and-so's girlfriend."
If you're too young to drive, then just wait until you know her better.
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