Is this a sign of shyness?

Everytime this girl speaks to me, her voice is noticeably softer, gentle, quieter than it Is with other people. With them she seems to talk in a normal voice, and is usually quite sociable, with me however, she's less talkative and her voice is either high pitched or really quiet
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I've also noticed that she looks at me a lot, and she's been doing It for months
Is this a sign of shyness?
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