There is this girl at work I talk to sometimes. Im still trying to get to know her but I noticed today that when she says hi to me her voice pitches up quite a bit. I saw her say hi to other guys and she didn't do it. Also later when I walked through her work area she did the high pitched hello to me and the girl standing next to her just started smirking. Do women do this often? It may be obvious to some of you but I just dont want to jump to conclusions.