Keep in mind this is just my opinion....but I don't understand potty training unless the child can get to the potty when needed. Once a child starts potty training and is well on their way, I remove them from the playpen to a cot or plastic mattress. If they need to go but can't get out, I don't feel this is fair. They will wet themselves and in my mind, this is setting them up for failure. Could this be why she has started holding it?
I haven't had a child potty train but not ready to move out of the playpen so I'm not sure what I'd do if they weren't ready for a big kid bed but ready to train though!

