Why did my girlfriend just cut her own hair?

I've been dating this girl for about a month and she called me yesterday and said she felt like she "needed a change" and she cut her hair off and asked me to come and help her cut the back of it. It seemed really random she's had it long for a while and she cut it pretty short. Is this just a hair change or is she going through something.
Why did my girlfriend just cut her own hair?
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