The Terps finished the regular season at 19-12, their best performance since joining the Big Ten.
Lewis has played very little so far this season but was the spark the Terps needed to win at Northwestern.
After dropping the third and fourth sets, the Terps came back and took a close fifth frame.
Jones began kneeling during the national anthem earlier this year and was recently criticized by spectators during a matchup with Nebraska.
The Terps couldn't match the Cornhuskers on the road, having difficulty with attacking errors throughout the match.
The Boilermakers closed the match on a 9-2 run to deny the Terps a chance at an upset.
The Terps were close to downing the Nittany Lions earlier this season, but they fell short, suffering a reverse sweep on Sept. 29.
Dowler had spent the matchup setting up her teammates to score, but when the Terps needed a spark, she delivered.
The Terps easily dispatched the Spartans behind Csire's 19 kills and earned their third straight conference win.
The Terps won their second straight game for the first time since Sept. 24, beating the Scarlet Knights in straight sets.