In the bottom of the seventh, Carlee Cantwell (4 for 5) lined a bases-loaded triple to close the gap to 11-10, but was stranded when Fiala (3 for 4) made the final out.
Sarah Kleinbrahm pitched the first championship in the six-year history of the Chargers program.
District 12 Class AAAA. St. Hubert claimed its third district title in four years with a 15-0, three-inning success against Central at La Salle University.
Jessica Grzywna allowed two hits to get the pitching win. Jazmine Ortiz knocked in three runs, and Brittany Smith added two RBIs.
District 12 Class AAA. Shannon Strickler's two-run homer punctuated an eight-run second inning as Conwell-Egan won the district championship for the first time, 15-0, over Franklin Towne Charter at La Salle University.
Gina Massaro and Laura Christine combined to pitch a three-inning two-hitter, with five strikeouts.
Radnor scored the last four goals of the game in the final 7 minutes, capped by Shannon Quinn's winner, and the District 1-champion Red Raiders edged Hatboro-Horsham, 15-14, in the first round of the PIAA state tournament at West Chester East.
Quinn, who had four goals in the game, scored twice to close the gap to 14-13 and Amelie Yeager tied the game with 1 minute, 45 seconds remaining to set the stage for Quinn's clincher.
Natalie Miller and Taryn Deck added three goals each for Radnor. Hatboro's Cortnee Daley led all players with six goals.
In other first-round action, defending state champion Garnet Valley (31-3) handed District 3 champ Manheim Township (24-1) its first loss, 15-13, as AnnaElise Morello contributed two goals and five assists.
Ally Heavens led the Jaguars with five goals, and Halley Barnes scored four to put the winners into the quarterfinals against Central League rival Harriton.
Conestoga eliminated Great Valley, 13-9, at West Chester East with Meghan McGillis' four goals and Catie Smith's three scores.
The Pioneers will play Strath Haven, a 9-8 winner over Archbishop Carroll at Plymouth Whitemarsh, in Saturday's quarterfinals at a site to be determined.
Harriton goalie Melina Avery almost earned a tournament shutout, making four saves and allowing two second-half goals in the Rams' 19-2 bombing of Nazareth Area at Emmaus.
Caleigh Foust paced the Harriton offense with six goals and two assists, and Jess Schwab added five goals and three assists. The Rams will face Garnet Valley in the quarterfinals Saturday.