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Either answer's possible. She could have a crush on you. She could also simply be shy, or friendly, as you said. She may want to be your friend, but is unsure how to approach you. The behavior you've noted does sound like the typical signs of a crush, but that doesn't mean you can be certain. Since she has a boyfriend and you're uncertain of her orientation, even if you do have some feelings for her, it probably wouldn't be a good idea to act on them. With a few obvious exceptions, for example, if she tells you she's in an open and/or polyamorous relationship.
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