Dead ball appeal

[jmkupka]

Just need clarification for my own mechanics.

R1 on 1B, base hit to RF, R1 misses 2B and is on 3B by the time ball is back in the circle. DC calls TIME (inexperience, or whatever, chooses not to use a live-ball appeal, and walks out to appeal to PU. Time is called, and at the same time, 3B coach tells R1 to get back to 2B quick.
At which point is it too late to correct her mistake?
As soon as ball is in circle?
As soon as time is called?
If the ball gets to the circle a split-second after she hits 3B, she'll be out on a LBR violation if she tries to fix it then, no?
PU, when time is requested, should pause until all action is completed, however no more action could legally happen at this point, correct?