To each her own right? Health of hair is far more important than looks, in my opinion. healthy hair is bound to look good. You don't need to use flat irons and chemicals(unless you ar styling it in a particular way) .
Heat and chemicals will eventually have a bad effect on your friend's hair. Maybe then you can have another go at explaining the cg method to her ..but really, you can't force someone to believe in your ideals.

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HAIR TYPE -2a-b, black, mostly medium
CO WASH, RO-HE HH and ENLEVEN and GARNIER RANGE
CLARIFY- I use sulphate shampoos silicone free(diluted), vinegar rinses
DC-pure coconut oil, olive oil, sometimes a SMT
LI-aloe vera gel + castor oil
I'm currently at BSL, aiming for waist length.I'm a very impatient person, wish me luck
I love my flat iron, but I love my waves even more. :-D