Operating on the assumption that yes, there is a problem there, even though, as usual, it does not affect every smart girl or woman equally or to an equal extent, and that it probably does affect the OPs daughter (and some other posters children) at least a little, can those of us who feel that it stopped affecting them or their daughters or that it never affected them at all, think of reasons why that might be?
I know that moving to a bigger pond definitely helped.
I also know that I was insanely lucky to meet my now husband while he happened to date a woman who was perfectly nice, pretty, thin etc,but happened to only have a high school education. He broke up with her after having met me, before even seriously considering dating me, simply because he realised how much he was missing intellectual stimulation in the relationship, and thus was primed to consider brains a feature rather than a bug.
In Short,girls and women like the OPs daughter need to find someone who does not feel threatened their abilities, both because they are confident in their own and enjoy them for theirs. I believe it is easier to find them inhigher education and in some workplaces, and easier once they are a little older than high school students, who have after all barely matured into men.
And beyond that, it’s just luck = if you like them and they like you back!