I spoke to her about it later and she said that she was trying to make him feel good about himself and that I didn't understand men at all hence why I've been single for 12 years and told me not to give her advice on that. I'm not sure what to do as I really want her to feel like she can be herself and not play up to what she thinks is attractive
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Dear oh dear. At this point, it would be very easy to reprimand her for that, but if you go in too strong, she might just double-down on what she's doing and not come to you for advice later.
You can tell her what your opinions are, but she needs to know that despite the silly thing she might say or do now, that you will be there for her if she comes out the other side, without a 'I told you so'.
I would try to keep it calm, and just say -
'I know it seems like a fab idea now, maybe you're not even wrong in what you're doing, but all it does is keep a man with you who is not really attracted to the real you. Some men love this whole girly, slightly dim personna. They might give you attention for it....but they won't respect you for it. You might not see that disrespect now, but it will come out eventually. It will come out when you're trying to argue a point, and he simply dismisses you as hormonal, he will have the last word on important decisions (because he always thinks he knows best because you're just a little girly). You might not think those things are important now, but they will come back to bite you in future. Some women just happen to be in relationships like that, but you are actively going down the wrong path if you carry on with this behaviour'
After saying something like this, I would leave her to digest it and not bring it up for a while.
However, more, worryingly, I would be wondering what is going on between them sexually. I'd dread to think :/