You're right and I, as a registered ASA umpire deem that rubber-band thingy is a hazard and wouldn't let her wear it so she either takes it off or doesn't play.
Okay. Not saying that you are wrong. For that matter, as an ASA umpire, the rule book gives you the authority to do exactly what you state. However, can you tell me what you consider dangerous about a rubber band on a player's wrist?
__________________ The bat issue in softball is as much about liability, insurance and litigation as it is about competition, inflated egos and softball.