Girlfriend dyed her hair, I do not like it. What should I do?

So my girlfriend has naturally dirty blonde hair, Well she died her hair brown and she looked really good with it brown. But now she dyed it blonde, like bure yellow/gold blonde and she has short hair as well and it makes her look...

I think she might of gotten the vibe that I didn't like it very much, but IDK. Should I say something to her about it, or just wait for her to dye it again?
Girlfriend dyed her hair, I do not like it. What should I do?
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