Help with my GFs HS

Hi! I don't know too much about HS but my Girlfriend(20) has an HS scar in the middle ,vertically, of her chest. This causes her to be super self conscious and she makes remarks about how much she hates her body and such. I always try to tell her that she looks beautiful and not to worry about it(I know, easier said then done) and that the scar doesn't bother me at all(she thinks that I will get disgusted by it). I was wondering if I could have some tips or suggestions about how to help my girlfriend feel okay with herself? I know it isn't just a flip of a switch