Does a girl's voice tone change when she talks to a guy she has a crush on?

Anonymous
There's this girl I like who I think likes me back. Among the things she does that makes me suspect this is that her voice tone changes when she talks to me in comparison to other people. She seems to speak with a softer tone and her words seem to drag out and be elongated. When I say hey to her when passing by she replies with a kind of shaky and cracking voice. Sometimes I can't barely hear her at all and at other times her voice goes way higher than usual. It's as if I'm almost intimidating to her.
Does a girl's voice tone change when she talks to a guy she has a crush on?
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