I don't want this to devolve into a girls v. boys debate, but the reality is that boys have different considerations than girls. The pathway for boys to the National Team or professional team is not through college, which stunts development, the best path is skip college and sign with a European or Latin American program once the player turns 18. Boys are physiologically better adapted to handle 4 training and 1 game day (because of bone structures, tighter tendons and ligaments, muscle mass/placement, larger ligaments, etc.).
The pathway for girls is through college. College admittance requires balance and good grades. Its asinine for US Soccer to tell the girls who have a much different path to devote so much time to soccer to support the DA League.
There are 65 clubs with U15 DA programs. Each team has roughly 20 players (some more and some less). 65x20 = 1,300 girls. There are about 20 spots open for the U15 gnt, which means that 64 girls exist in the program to benefit 1. Odds are roughly 1:64 make the GNT, which means that 1,280 girls will practice 4 days a week, play 1 or 2 games over the weekend for those 20 girls that US Soccer has its eye on. Many of the 1,280 girls will suffer lower leg injuries, stress fractures and have a very tough time keeping their grades up because of the training and travel demands. Its not uncommon here in SoCal that training on a DA team will consume 3-4 hours or more per day (time in car, training, time in car), with players trying to squeeze in homework in the car and social events are simply declined.