To reach teenage girls, the focus should not be on competition nor racing for the majority of girls at that stage. Instead more focus on cycling competency, endurance and confidence to take on long routes, busy traffic ...while also having fun. When there is clear evidence that many teenage girls (to me) look heavier than teenage girls were 30 years ago, cycling certainly can become sellable option as healthy fun thing to do ...if the girl doesn't feel safe or too exposed to be jogging solo. At that age, I would tend to build in some social time for teenage girls during a ride/workshop(s).
I was an awkward, brainy nerd in high school and for certain, suggestions of racing/competition would have intimidated me from cycling. thank god at that time, I was still cycling in cemeteries where I felt safe from roaring traffic

But then I was wierd and abit of a loner who did my own thing.