No offense but there are way more people who will drop the ball and not care about it if you use volunteer than if you use the word mandatory. I asked for volunteers last year for my son's baseball team for umpires. By League rules, we had to provide a home base umpire or a field umpire for each game. My first email was nice asking for volunteers, saying you can pick your date, since we all have other obligations, we even said it did not have to be you specifically that you could have Uncle Joe do it if no one else was available they just ahd to be over 18.
I got 3 responses out of 12 back. Send out another email, telling them what dates were taken, still nothing. My final email told them that this was mandotory per League rules (which it was) and then I assigned dates accordingly. We had one person flake the whole season.
I also dont agree with penalizing the child for their parent's behavior but unfortunately it happens around here. Parent gets the child their late the player is penalized.
OP so this lady does not show and then loses her money but she proabbly wont care about that, but it stinks bc you are still short a person to fill a shift.