In addition to Oppegård IL, 19 other teams from 3 different countries played in Girls 18/19 - born 2000 - 11aside. They were divided into 5 different groups, whereof Oppegård IL could be found in Group 2 together with Utleira IL, Kaohsiung Municipal Rueisiang HS and Raufoss Fotball 2.

Oppegård IL continued to Playoff B after reaching 4:th place in Group 2. In the playoff they made it to 1/8 Final, but lost it against Stordal IL - Fotball with 0-1. In the Final, Valur won over Strindheim IL and became the winner of Playoff B in Girls 18/19 - born 2000 - 11aside.