What does it mean when a girl suddenly changes her hairstyle?

Greateye

Why would she let her ponytail off to see her long hair loose while I'm near her?

She sometimes looks at me from a distance (even when I'm not looking) sometimes when I notice looking at me she looks away quickly. I'm with a friend taking about something (not related to her, more of a show that we watched) while she's talking with some of her friends nearby.

They've started talking about singers and concerts, they've started to talk kind of loud enough for me to hear most of the conversations. This girl is usually has a ponytail as a hairstyle for work. While they were having fun and laughing, almost at the end of that conversation she let's go of her ponytail and leaves her hair loose for a while (I think it was more than 5 minutes, can't guarantee on that and she wasn't hiding it). She sometimes started talking at a high volume, enough to get someone's attention and would take a few steps around the area that we were. I can't be more specific because she was kind of behind me.

It wasn't a hot area because we're under A/C at 68 degrees.

What does it mean when a girl suddenly changes her hairstyle?
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