Illegal Substitute?

[Toren]

4th quarter girls varsity game last night. Player #15 commits a foul that my partner has a whistle on. He goes and reports the foul and then the coach asks for a timeout. My partner grants the full timeout. All players go to their respective benches. The score table calls my partner over and informs him that player #15 is not in the book.

I have a few thoughts go through my head: We're in a timeout, so as long as coach doesn't play her again, we don't penalize the team a technical...wait, we have to penalize because she committed a foul, so the coach has to add her to the book at a price of a technical. Hmm, not really sure.

So we go with what everyone expected. A technical.

After the game, partner and I both pull out books and we find case play 3.2.2 situation c (I don't currently have my book, so I hope I'm remembering that case play correctly). But it basically states, during an intermission the scorer identify's that a player was not listed in the book and the ruling is we don't penalize as long as that player doesn't re enter.

Did we administer correctly? or was this an "exception" because we granted the timeout already? or perhaps a different reason?