Lamoureux has provided a much-needed consistency with her energy, outlook and reliability to a revamped Terps defense.
Faceoff specialist Luke Wierman won just five of his final 15 face-offs.
The Terps scored nine goals and shot just 28.1 percent against Northwestern in the Big Ten championship.
The No. 4 seed Terps will host a postseason game for the third consecutive season.
The Terps defeated the Dragons 15-9 in their regular season matchup.
The Terps were outscored 7-3 in the second half.
The Terps failed to win a Big Ten regular season or tournament title for only the second time since joining the conference.
The Terps will play for their fifth Big Ten championship after outscoring the Scarlet Knights 10-1 in the first half.
The Terps will face Michigan in the title game after coming back to beat the Blue Jays.
Ahearn has helped the Terps notch the third-best draw percentage in the nation.