Unrep Sub: Say Something or Stay Mum?

[Manny A]

I worked an ASA tourney over the weekend, and I had a situation where I wasn't sure if I did the right thing by exercising a little preventive umpiring. The offense's DP reached base on a walk, and her head coach requested time to enter a substitute runner. The offense ended up batting around in the inning, and when the DP's slot came back up, the original DP came up to the plate.

Typically, I wouldn't notice when someone who isn't in the game enters to bat or play defense. But this DP was not a typical player. She stood about 6' 4" (I'm 5' 9") and had a huge pink bow holding her ponytail together. So when she came up, I recognized she was the player who was removed for a sub earlier in the inning.

Rather than just letting her bat, I called Time and went over to her coach to inquire whether or not he was re-entering the starter. He had forgotten that he made the substitution, so he sent up the girl who ran for the DP, and we continued playing. Nobody from the opposing side said anything.

Should I have kept quiet about the unreported substitution? Is that covered in any ASA guidance to umpires?