In addition to Lillestrøm SK, 124 other teams from 11 different countries played in Girls 15. They were divided into 31 different groups, whereof Lillestrøm SK could be found in Group 24 together with Bergdalens IK, Farstorps GOIF/Hästveda IF and Lessebo GoIF. Lillestrøm SK continued to Play off A after reaching 2:nd place in Group 24. In the playoff they made it to 1/32 Final, but lost it against Lerums IS with 0-1. In the Final, LB07 won over Eskilstuna United DFF and became the winner of Play off A in Girls 15. Lillestrøm SK also participated in Girls 14 during Gothia Cup 2013. They reached the 1/32 Final in G14 Play off A, but lost it against Hönö/Björkö with 1-4.