Mustonen was offered the Finnish women's national ice hockey team head coaching position at the suggestion of Aravirta, who had turned down the position in favor of retirement when Kalervo Kummola, chairman of the Finnish Ice Hockey Association, offered it in Spring 2014. Mustonen began in Summer 2014, despite having no previous women‘s coaching experience, and inherited a team that had been kept off the medal podium three consecutive times, ranking fourth at both the 2012 and 2013 IIHF Women's World Championships and fifth at the 2014 Winter Olympics, the lowest Olympic ranking in team history.