The Lady Rockets fell 61-56 Tuesday night in Chapel Hill in a contest that they fought from behind in most of the game.
"Every time we had a lead, we did something not smart to lose it," said Forrest head coach Jeremy Jean. "We kept doing stuff we couldn't do and it came back to bite us. Everybody is shooting layups on us and we can't defend."
Forrest never led by more than four points in the ballgame and had to fight from behind by as many as seven points early in the third period.
The Lady Rockets rallied back to take a one-point lead into the fourth period, before finally surrendering the lead for good with just under five minutes to go in the contest.
Forrest's Caitlyn Yost set a school record for most points in a game by an eighth-grader, pouring in 29 points in the contest, including a 9-11 effort from the free throw line.
MTCS held a 14-13 lead after the first period and built their margin over Forrest to 27-22 at halftime.
Devan Welker scored for MTCS on the initial touch of the third quarter, opening up the biggest lead of the night for the Lady Cougars at 29-22 before the home team fought back.
Yost scored on a three-point play after snatching an offensive rebound for a put-back with 1:02 remaining in the third quarter, putting the Lady Rockets up by one-point at 41-40.
Yost would hit both ends of a one and one moments later and Scarlett Roberson made it a two-point game on a single free throw.
Savannah Brothers stole the rock at the other end and fed Yost for a fast break lay-up and the eighth-grader was fouled on the drive.
Yost buried the go-ahead foul shot.
MTCS' Meghan Smith, who led the Lady Cougars in scoring in the game with 17 points, muscled in a bucket in the paint, seesawing the lead back to the visitors.
Yost and Sweeney traded three-point plays before a Yost jumper gave Forrest the lead for the last time at 52-51.
MTCS went ahead by three points, thanks to a 4-0 run, but a Tayler Andrews rebound and put-back sliced the Lady Cougar lead back to a single digit with 1:32 remaining in the contest.
From there, MTCS sealed the game from the free throw line, going 4-6 down the stretch for the victory.
The win gave MTCS (12-9, 6-5) the tiebreaker over Forrest for fourth place in the District 9-A standings, while Forrest (9-14, 5-5) dropped to fifth with four league games remaining.
"We had a chance to finish third, but now it's possible, but very unlikely," said Jean. "We will probably end up playing on the road and that is something we did not want to do. We just have to try to get a little run going and get some confidence, going into the tournament."
Candace Daughrity ended up with seven points for Forrest and had their only three-pointer in the contest.
Brothers and Hannah Evans scored six points apiece, Roberson netted three, Hannah Phifer and Andrews each had two points, and Amanda Chumbley had one free throw.