Ryan took over in the circle in the sixth and would throw the final four innings of the game.
She then led off the bottom of the sixth with a triple and scored the game-tying run on a Sophie Georges RBI groundout.
The teams would match scoreless seventh and eighth innings, though Foothill survived some heavy drama in the eighth with Westchester notching a pair of one-out singles. Smith, in right field, made a clutch basket catch, however, and then doubled up the runner at second for an inning-ending double play.
"It was such a crazy night," Coach Howard said.
Ryan ran into some trouble in the top of the ninth when she gave up a single and a double to start the stanza before retiring the side in order thereafter, but not before Westchester had taken a 6-4 lead.
With the 7-8-9 hitters due up in the ninth, things looked bleak for Foothill, but it was hardly the team's outlook, according to Howard, who added that assistant Meghan Spencer, a junior-to-be at Glendale High, deserved praise for always keeping the team's spirits up.
"I think it all has a lot to do with Meghan Spencer and her talking to the girls about how they have to seize the moment," said Howard, adding that him and co-Coach Todd Fabian deciding to bring on Spencer was an invaluable choice. "It was probably the best decision we've made."
With one away in the ninth, Smith reached base on an error before Campbell drew a walk. Fabian then batted in Smith on a groundout before Lousararian once again came up clutch, lining a game-tying single to score Campbell. An Alex Howard single followed to set the stage for Ryan.
"I just cleared my head and did the best I could," said Ryan of her approach to the game-winning at-bat.
Foothill, after receiving Saturday off, also had Monday and today off, as Anaheim Loara and Colton were set to play Monday with the winner facing Westchester today at 5:45 p.m. Foothill will play the winner of that game at 5:45 p.m. and if it loses would play an if-necessary final shortly thereafter.
Said Coach Howard: "We're in a great spot."