What do you mean final..like they don't reevaluate year to year?
Every State has a ODP team at each age bracket, with California having 2 (Cal North and Cal South, or CN and CS). So 18 kids are chosen. They then take 12-13 states from 4 different regions and make 4 regional teams. This is chosen from a camp for each region over 4 days.
When my daughter went to the camp it was in Ojai and she was there with about 16 other CS girls, and a total of about 130 girls, including 13 other goalkeepers, from West region States like Utah, Washington, Arizona, etc. There is also East, South, and Midwest camps. Then one team is chosen for each of those regions with 18 girls, giving you 4 teams of 18 players. These 72 players went to Florida just before Thanksgiving, and played games and trained. They then chose a final team of 20-24 girls that is going to the ODP National Training Center.
They also have Region Championships which was just held in Arizona where Cal South beat Utah in the finals to win 2005 age bracket. My daughter played games 1,3,5, which included the finals. First three games every field player was getting time, but semi's and finals saw a shorter bench.
Yes the team is reevaluated year to year. There are some nuances to that, of course.