Why does a woman change her hairstyle?

Ok, so I have this cursh on a girl and I suspect she knows but I'm not sure. Anyway, she changed her hairstyle recently from one without bangs to one with bangs. She looks amazing now. Although she looked very good before too.

I just wondered if there are some common reasons for why a girl would change her hairstyle? I know she's going to compete in a sports competition the next week so maybe the reason is as simple as that. What are your reasons?
Why does a woman change her hairstyle?
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