Especially when they're going off to university, having someone in a mentorship position is key. Most often, for girls who have been through a program and are really finding their way, if they've had an experience in FIRST we know that they've developed the competencies they need, and that will often lead to the confidence they have. The third piece is the connections they need to make, which they need on an ongoing basis to be able to reach out to a network. It may be at their specific university or it may be nationally. Karen alluded to technology; they could be Skyping with people.
As Bonnie said, it's important to include mentors who are men as well, who believe in them as women in those roles, because that's the systemic change we need to see. It doesn't matter what gender you are, you are appreciated for what it is you can do. That's the key piece. It's not just women supporting women, but it's a cultural shift to be able to promote girls in those ways.