The fourth-seeded Rams will look to three-peat on Friday night at Villanova, where they will face third seed North Penn for the district title.
It was the third straight come-from-behind win for the Rams (23-5), who recently have had a flair for the dramatic.
The Mount (24-3) led for three quarters, powered by Alex Louin's game-high 17 points. While the Magic extended their lead to as many as eight halfway through the third, they never put the Rams away.
That's when Mueller started talking about being strong with the basketball.
"We definitely need to pick it up and have a stronger start," Mueller said. "That's something we need to work on, but we never give up. We always have heart."
Mueller scored seven of her 10 points in the second half, in part because she took her own advice about being strong with the ball.
The forward gave the Rams their first lead of the contest, 27-26, with less than seven minutes to play and then did it again a few minutes later, putting her team up by 30-28.
On defense, both squads played a lot of zone, disrupting usually high-powered offenses.
"We needed to switch up the tempo because they were getting the ball and getting to the basket, so we really needed to slow them down and throw them off," Beyer said.
Sammy Stipa and Beyer each added six points for Spring-Ford. Libby Tacka had six for the Magic.
Spring-Ford 7 11 5 11 – 34
Mount St. Joseph 16 4 6 7 – 33
SF: Shelby Mueller 10, Sammy Stipa 6, Abby Beyer 6, Maggie Locke 4, Molly Hynes 3, Julia Roshelli 3, Amy Roth 2.
MSJ: Alex Louin 17, Libby Tacka 6, Carly Monzo 4, Mary Kate Ulasewicz 4, Colleen Steinmetz 2.