#1. She is a child. I shouldn't even have to say that.
#2. How somebody looks has nothing to do with their intelligence or capability. It's incredible that you say there's "nothing wrong in pointing out attractive women scientists to girls" when, in fact, there is everything wrong with it. 'Attractive' is almost exclusively a measure of how much effort a woman puts into modifying her physical appearance in order to make herself sexually inviting to men. I don't have a problem with this; what I have a problem with is men telling women (and girls!) that they have a responsibility to be attractive in order to be acceptable.
#3. Women shy away from male-dominated fields such as science, technology, and video games because men don't know how to act normally about them. If you read an article about a 15-year-old boy with glasses and plain hair, you would never make a comment that "he has so much going for him, if only he'd ditch the glasses and do something with his hair...
Something to think about.
Also, please stop acting like a sexist pig. Thank you.