Edwards led all scorers and was 5-of-6 from the charity stripe for Lamar (6-7, 1-1 SLC) in the last two minutes. Northwestern State fell to 8-6 overall and 1-1 in league play.
The Cardinal defense forced the Lady Demons into 19 turnovers that resulted in 25 points from turnovers.
Northwestern State jumped out to an early lead scoring the game’s first seven points four minutes into the game.
Chelsea Rogers opened the game with a jump shot followed by a layup from Presley Owens less than a minute later on an assist from Trudy Armstead.
Armstead caught the ball at the top of the key and backed her way down the lane before she sent a no-look pass to Owens.
Owens hit a 3-pointer 45 seconds later.
The Lady Demons held the lead 13:16 left in the first half when Edwards hit a jumper in the paint to tie the game at 12-12.
Northwestern State grabbed the lead back on a 3-pointer from Janelle Perez and pushed it to five with a jumper from Kourtney Pennywell.
Lamar finished the half on a 22-10 run and had a five-point lead at the half.
Northwestern State came back and grabbed the lead with 14:48 to play in the first half, but Lamar took it back 13 seconds later.
Other than one tie, Lamar would not relinquish it.
Armstead led the Lady Demons in points and rebounds, 18 and eight respectively. Northwestern State had five players with 10 or more points: Keisha Lee (14), Rogers (12), Pennywell (12), and Perez (11).
It’s the second-straight game that the NSU has had five players in double-digit points.
As a team, Northwestern State shot 58.5 percent from the field and 31.6 percent from behind the arc. NSU was only 11-of-18 from the free throw line.
Lamar was 48 percent from the field, 39 percent from behind the arc and 68 percent from the charity stripe.
The Cardinals only turned the ball over 11 times, which led to 11 points from turnovers.
Northwestern State will continue Southland Conference play on Thursday at Texas A&M-Corpus Christi followed by Houston Baptist on Saturday.
NSU will return home to host Stephen F. Austin on Jan. 16 at 5:30.