How to convince my girlfriend about her hair?

This is something I haven't really seen before. My girlfriend is so obsessed on trying to be blonde. She has beautiful dark brown hair, but she hates it. She dyed her hair so many times, bleached it just to get that perfect blonde colour and she's still not liking it.

I already convinced her that dark brown suits her better. I'm trying so hard to convince her that hair colour really dont matter. blonde suits some people more (light eyebrows and eye colour) and some people not. But now she hates how blonde doesn't suite her. She hates her eyebrows and eye colour because of what i said.

I really need someones help. I'm afraid that i'm doing more harm than good. How do i need to approach this? Right now I have told her to take baby steps. Step one is to accept that dark brown suits her more and that she shouldn't overthink too much about her hair (which is kinda working). I told her step 2 is to accept that blonde is really not special. It's average and does not make a person look prettier. Step three is to accept that her natural hair is beautiful.

My question is how do I guide her to step 2 and step 3 without doing more harm than good. Thanks in advance. Any help is appreciated.

Please know that my intention is not to limit her exploring her looks and experimenting. This is not the case, she genuinely hates her natural hair and i'm just trying to let her love her natural hair.
How to convince my girlfriend about her hair?
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