 Following her college career, Solo was selected in the first round (fourth overall) of the 2003 WUSA Draft by the Philadelphia Charge. She spent most of her first professional season on the bench playing in eight games. Solo started the last three games of the season and earned her first professional shutout against the Atlanta Beat. She also shut out eventual league champions, the Washington Freedom led by top scorers, Mia Hamm and Abby Wambach. After the WUSA folded following the 2003 season just six days before the 2003 FIFA Women's World Cup, Solo moved to Göteborg, Sweden in February 2004 to play for Kopparbergs / Göteborg FC in the Swedish Premier Division, the top division of women's soccer in Sweden. For ten months, she played in two games a week, making 19 appearances in goal for Göteborg in 2004. In 2005, she played for Olympique Lyonnais in the French First Division. She made seven appearances for the French club. Solo said of her experience in Europe, "I played in Europe and it was a great experience, not just because of my teammates and the coaches we had, but from the fans and the city itself – I played in Gothenburg and I played in Lyon and soccer was everywhere. At that time in my life, it really jump-started my career and really helped me find myself as a person and player."
