I've been on the other side of this...up 15 and trying to end the game. Instruct base runners to step off and take the out. Pitcher had 4 pitchers over your head, in the dirt, wide right and wide left. We had a Runner 1B and 2B. I called time and told both runners to step of the base before the pitch and take the outs. They did so 3 times, 3 pitches in a row. No call by the umpires. I called time and went to the Homeplate ump. I quietly said "Blue, I'm pretty sure that runner on 1 and 2nd left early on the last couple pitches". He looks at me and says "Hey coach, thanks for noticing. Let the other team play and let's just play the game." I had my next two batters swing and miss at anything to get the game over with.
We've had to alert the umps too.
At some point, just have your girls step off and wait to get tagged out.
Parents don't like forcing their DDs to get a K on their Game Changer.