In February 2015 Sonnett again appeared in all three games in the 2015 U-23 Six Nations International Tournament in La Manga, Spain helping the team earn their second consecutive tournament title and serving as captain in their match against Norway.[60][61][62] Although Sonnett was called up to the USWNT U-23 training camp in Lakewood Ranch, Florida in April 2015, she was not named to the roster for the 2015 Four Nations International Nordic Tournament held in May 2015.[63][64]