With Vanderbilt owning a one-point lead in the final seconds, Monk out-battled the Commodores for an offensive rebound and converted it into a layup as the final buzzer sounded, giving the Razorbacks a 57-56 victory on Monday night.
Jessica Jackson finished with a game-high 18 points for Arkansas (10-14, 5-6) before fouling out. Rachel Bell led the Commodores (15-8, 4-6) with 12 points.
Vanderbilt trailed 47-25 late in the third quarter before putting together a 22-2 run to tie the game at 49-49 on a layup by Jasmine Jenkins with 3:32 to in the fourth quarter.
The Commodore then took their first lead of the night on a free throw by Marqu'es Webb with 1:59 to go. That set the stage for the wild finish that was ultimately capped by Monk's last-second shot.
"I'll give our kids credit for battling back tonight," said head coach Melanie Balcomb. "But the thing is, we can't wait until we get down 12 points -- or in this case, 22 points - to start playing with fire and energy. That's what disappointed me about tonight."
It was the third straight loss for the Commodores, who trailed 29-20 at the half and were down 49-33 at the end of the third quarter.
"Once we got into our press, that's when we made our move," said Balcomb. "Jasmine Jenkins came in the game with a lot of energy and helped us get back in the game."
The Commodores fell behind 18-5 in the first six minutes of the first quarter as Jackson scored six points -- making a 3-pointer and a conventional 3-point play -- to help the Razorbacks build the early lead.
But Vanderbilt charged back with a 13-2 run that started late in the first quarter and spilled over into the second. Dahlman ignited the run with a 3-pointer from the top of the key, and Bell added a couple of baskets, including a jumper that capped the surge and pulled Vanderbilt within 20-18
Arkansas then closed the first half with a 9-2 spurt for a 29-20 halftime lead.
The Commodores were 9-of-22 from the floor in the first half, including just 1-of-4 from 3-point range. Christa Reed, the Commodores' top scorer and ranked fourth in the nation in 3-point percentage, played just five minutes in the opening half due to foul trouble.