LaGasse stole the ball again on Hammond's next possession and converted two free throws on the other end of the floor, increasing the Lady Warriors lead to 54-45 and essentially icing the game.
LaGasse scored nine of her game-high 28 points in the fourth quarter, seven in the final 2:39. She also had five rebounds and two steals in the game.
“We started slow but just we finally started making a few shots,” LaGasse said. “Everything loosened up and we just relaxed and started playing.”
Lomega (27-6) now will get an opportunity to defend its state title against Erick in a noon championship game at State Fair Arena.
“We worked hard all season,” LaGasse said. “We lost a few games we shouldn't, but we wanted to come back (to the state title game).”
Seniors Kori Barrios and Peyton Walker scored 19 and 13 points for Hammon (26-5), which lost in the state championship game the past two seasons. Barrios also had 12 rebounds.