Melissa Stokes is entering her 24th season as head coach at the school.
The Royals beat Lucas Giolito for the first time and thwarted his bid for a 12th victory.
It was first complete game by a Cardinals pitcher this season. Mikolas had the only one last year on May 21 against Kansas City.
The decision comes after a fan was hit by a ball Sunday during the Royals' game against the Detroit Tigers.