Not the expert here, just a trainee like you, but I can tell you what we are doing just FYI.
When Penny poops in the wrong place, we take her to the place she did it and say in a low, but nice voice, "Noooooo, not good." Then we pick up the poop with some TP and walk to the pad and put it there and tell her, "Gooood, poop on the pad!" Today we actually added giving her a treat when WE put it on the pad just so she might get the idea of poop on the pad means a treat.
I can't say for sure this is why she pooped on the pad 2 out of 3 times today or not. Just in case that is why she suddenly started putting it on the pad, I thought I would post it here for you.
By the way, she actually only got is "square on" the pad once, but she just pooped right on the edge of the pad again a few minutes ago. The time she didn't go on the pad was this morning when I thought she was on empty and let her follow me back to my bathroom. She squatted right next to the toilet I was cleaning.
