Why did this girl block me on Instagram for no reason?

Prettyapathetic
We would greet each other at school and that’s how I know her. I followed her on Instagram after seeing her on my friends list and she accepted like 3 weeks ago. I changed my hair blonde and a day after I see that she can’t be found and she blocked me ( I’m not sure if that’s the reason why ). I never said anything to her to make her do that which is strange.
Why did this girl block me on Instagram for no reason?
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