Is it signaling anything if a girl says bye to you in a super high pitched voice and really loud?

I dont know how it happened was aking a girl to hang out and gave me some excuse but it seemed to be legit. She was about 1 foot away from me. But she didn't move away. The she walked away really quickly and said bye in a loud high pitch tone a voice than what is normal. Any ideas? Is this flirting?
Is it signaling anything if a girl says bye to you in a super high pitched voice and really loud?
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