The Lady Falcons were buoyed by a stellar performance from point guard Cortney Story, who poured in a game-high 25 points with one trey and a solid 6-7 performance from the free throw line.
The Tigerettes fell behind early, down by 13 points at 15-2 before mounting a mini-rally, started with a Kiya Morris bucket in the lane with 1:38 remaining in the first quarter.
"That 13 points that early in the game felt like about 25, because we just could not get anything rolling offensively," said MCHS head coach David Junkins.
Morgan Moyers turned a missed Lady Falcons' shot into three points at the other end, cutting the Lincoln County lead to 15-7.
Khaila King scored on back-to-back possessions for the visiting squad, but Allison Hargrove's three-pointer to end the period kept the Tigerettes in sight at 19-10.
Hargrove converted an old-fashioned three-point play to begin the second period, but McKinley Slaton negated the effort with a long-range trey.
The Lady Falcons staved off the Tigerettes, building their lead back to double digits at 26-16 midway through the quarter.
Morris began to exert some pressure on the offensive end for MCHS and it paid off, as she would go to the free throw line on back-to-back possessions, nailing all four attempts to cut the Lincoln County lead to six points.
King would make one free throw before a Lincoln County timeout with 4:20 remaining in the first half.
After the huddle, Moyers scored and after a short dry spell by both squads, Michala Hopkins made it a four-point game at 27-23 with one of two from the charity stripe.
Hopkins would score four points early in the third quarter and Hargrove tallied eight late, but the Lady Falcons came up with a big 17-point quarter and led 48-38 after three quarters of play.
Lincoln County went on the offensive to begin the final eight minutes and soared ahead via an 8-1 run.
The closest the Tigerettes would get the remainder of the contest was 11-points on a Moyers three-pointer with two minutes left.
Lincoln would stretch their lead back to 17 points at 65-49, but Hargrove sent notice that there was no quit for MCHS at Dottie Kelso Memorial Gymnasium, draining a three-pointer and then hustling to steal the ball and scoring with three seconds remaining in the game.
Hargrove turned in another solid performance for Marshall County with a team high 19 points, including 2 treys and a perfect 5-5 effort at the free throw line.
"Allison has been unbelievable and when you couple that with her not playing her sophomore year, it makes it truly unbelievable," said Junkins. "She took that year, realized she really missed basketball and now she is going 100 percent in games, 100 percent in practice and doing everything the coaches are asking her to do."
Moyers scored 16 points (2 treys, 4-4 at the line), Hopkins netted eight (5-5 at the line), Morris scored on five out of six tries from the charity stripe, Marissa Lyttle ended up with three points, Megan Sanders had a single basket and Christy Pettigrew tallied one free throw.