I have four DDs, three of whom are very into maths and science. The youngest is a history enthusiast. All of them wore (and wear; youngest is 14) lots of pink clothes, and had their hair long and loved nail polish as girls and still do as young women. They always wore some makeup to school as teens, and they liked fashion and having nice hair.
Young women these days doing interviews and entering careers are expected to be very polished and confident about their clothing and appearance and accessories. If you don't wear makeup or do your nails you still need a 'sophisticated' look or style.
To some extent the same goes for young men.
You are seriously disadvantaging your DD by implying to her that there is something faulty or second rate or suspect about things that are 'girly', 'girly' interests, 'girly' adornment. The trick is to emphasise how 'girly' maths and science are too.
You don't have to start a girl young when it comes to doing herself up in order to end up with someone who knows how to choose appropriate nail products, deal with hairstylists, know how to apply makeup, walk in high heels, etc. But you do need to give girls confidence in themselves as girls. Boys are very much encouraged to feel good about themselves as boys.
I was a meccano and Lego - loving girl myself and I grew up in the 60s and 70s. I remember an environment that was very unisex in many ways but it was still shockingly misogynistic. Unisex was acceptable but girls who were pretty, blonde, or who took trouble about their appearance were considered bimbos. Basically, if you looked like a boy, or if you looked and acted anything but very 'feminine', you were acceptable. The message that girls were second rate was loud and clear.