I didn't read it that way. I read it that she considers her daughters to be beautiful and wants them to know that beauty endures and changes over time, that the inner beauty must be appreciated as well. I don't see anything wrong with that. I also see that there is some confusion between being beautiful and being sexy. I think that all of the women on Golden Girls were beautiful, and not one of them seemed at all sexy to me.
Women in general are not sexy to you, so your Golden Girl argument falls short.
I do know what you are saying, though. I think the mom was trying to teach her girls about beauty, but she was doing it in a way that also was all about her.