Ulster under 18s Girls finished the two matches on the losing side after last week's 22-7 defeat against Leinster in the opening round of action.
In the other game on Thursday, Leinster edged Munster 29-22 in a tight contest.
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The U18 Girls Development Interprovincial Series provided a platform for young players from all four Provinces to stake their claim for selection ahead of April’s U18 Women’s Six Nations Festival.