I don't know Glocks, maybe they have to have a magazine in the chamber to drop the hammer.
They do not.
Whether or not the gun is known to be loaded, you still
never touch the trigger unless and until you have picked out the safest place in the area for a bullet to land, and have pointed the gun in that direction. (That's what "until you are ready to shoot" and "be sure of your target" actually mean
If the department would frown on live rounds going into the ceiling, and if the armorer's squad mates would frown on live rounds crashing through the wall and landing in the break room, then the department needs to install a safe backstop in the gun handling area. A bucket of sand would do it, and wouldn't break the budget. If you want to be fancy, make it a Safe Directions product of some sort. Slap a target on it and remind everyone involved that they don't
touch the trigger, regardless of the reason, unless the gun is pointed at a target.
Glad your daughter is okay.