I have a less optimistic anecdote to share. I really lost my way once I got to college and didn’t have the structure to my schedule or social life that a sport provided. I was at a smallish school with a relatively large proportion of athletes and I felt a keen loss of status as well. I knew who I was in high school, but at my competitive university, I wasn’t anything. I also wasn’t good enough at another activity (newspaper, debate, theater, music, etc) to find an extracurricular that satisfied my need for a big commitment. I volunteered here and there and got campus jobs, but I would have been happier had I realized that I should have gone to a larger school where plenty of people did no extracurriculars or a smaller school that would have been happy to have me on their team.
I think your DD’s experience will depend on the size and competitiveness of her school and how social she is, but I hope she will thrive and find new places to put her energy!