In addition to Marin FC, 39 other teams from 8 different countries played in Girls 13. They were divided into 10 different groups, whereof Marin FC could be found in Group 1 together with Lerums IS, IF Brommapojkarna and Eskilsminne IF 1. Marin FC made it to Slutspel B after reaching 3:rd place in Group 1. Once in the playoff they made it all the way to the Final, but lost it against Kullabygdens DFF with 1-2. Thereby Marin FC finished second in G13 Slutspel B during Gothia Cup 2012.