[williebfree]

Is it good game management to "T" the player for inattentiveness (or whatever reason she may be staring into the wild blue yonder)?

I see this situation as having two options:
1. Beckon a second time, she "gets focused" and enters the game.
2. Beckon a second time, player continues to daydream. Resume play without her.

With option two the coach might get a bit upset, but you offered the substitute ample opportunity to enter.

Additional note: there are other factors to consider. Is this the first "delayed" sub, are the timer and scorer competent, has the coach been "playing manipulations games" prior to this incident, etc...