Lebanon led by as many as 15 in the second quarter, but Frankfort cut it to nine at the half.
Despite the Hot Dogs cutting the lead to seven midway through the third quarter, the Tigers were never not in control of the game and gradually pulled away in the fourth quarter.
DeVinney said the Tigers needed better focus early in the game, but said the early start wasn't a problem.
"Our kids are pretty resilient and have made it through every obstacle someone has thrown at us this year," she said. "It is a different time of day and a different adjustment. I don't think our focus was that good early, but as the game went on it picked up. Tonight is going to be one of those traditional battles and if we come out with that focus tonight the game will be over by halfitme. We have to have a much higher level of focus this evening."
Kristen Spolyar led the Tigers with 22 points. Brooke Montgomery added 9 and Carly Greene had 8.
DeVinney and her Tigers will be going for their fourth-straight sectional title this evening.
"We have to keep their shooters under control," DeVinney said. "We let (BayLee) Mitchell have 17 in the first game and we have to keep her and the other shooters under control. We have to try our best to keep (Emily) Harrison under control too. But rebounding will be a key. We haven't been doing a great job of rebounding and we have to have people crashing the boards and rebounding. That has been a concern and when we rebound with teams, we are very good. We played at Western, one of our better games I have seen us play this year, and we had 38 rebounds in that game and beat the No. 2 team in the state. When defense and rebounding is your priority, good things will happen to you. But if we play with our effort from earlier today, it won't happen for us."
The game is scheduled for 8 p.m. tonight with doors opening at 7 p.m. at Western Boone.
Game will be broadcast on RadioMom 91.1 and twitter updates will be provided at @LRSports.