Crowder, you idiot, you're wrong!
I am going to take the other side, however.
ASA 6-B: ...The use of an unreported substitute is handled as a protest
by the offended team while the player is in the game. (emphasis mine)
Since she is coming to bat, there is a potential opportunity for an out if the defense is paying attention. (6-C-3). It's not your job to remind the coach to report her back in the game.
I believe this to be a different situation than preventing a coach from making an illegal substitution. In that case, the penalty is more severe, a disqualification as opposed to an out, at the most, for an unreported sub.