She came into the national program in the early 1990s, won a World Cup title in 1991, and was then cut from the 1995 roster, a disappointment that would have ended less stubborn athletes. Instead she rebuilt her game, worked with coaches who pushed her to think differently about her positioning, and returned transformed. What followed was two more championships, two Olympic gold medals, and a style of play, aggressive, intelligent, fearless in the tackle, that set the template for how a modern defender could also be a weapon. She understood her sport dimensionally in a way her era rarely demanded of defenders, and she performed at that level long enough to matter across three different decades of the program.

After she stopped playing, Chastain got to work. She co-founded BAWSI, the Bay Area Women's Sports Initiative, connecting women athletes with girls in under-resourced communities and children with disabilities. She coached, broadcast, mentored, and became one of the more prominent voices on concussion awareness in youth sports. Then she moved into ownership: co-founder of Bay FC in the NWSL and a member of the ownership group for LOVB San Francisco, building the infrastructure of women's sports from the inside. The kick seen around the world was thirty seconds. The work was a lifetime.