UVA were again runners-up to the 2015 ACC title, losing 2–2 (PK 6–7) to Florida State, and Sonnett was again named to ACC All-Tournament team.[28] She led UVA to the quarterfinals of the 2015 NCAA Women's Tournament, losing to Rutgers University after double overtime in penalty kicks (6–7). Sonnett ended her senior season at UVA with 3 goals and 1 assist and was named a finalist for the Hermann Trophy.[27][29] Additionally, Sonnett was named the 2015 ESPNW Soccer Player of the Year, Honda Sports Award Nominee, NSCAA first-team All-American, ACC Defensive Player of the Year, and first team All-ACC selection.[4][27][30][31]