[lucyjoy]

At this age, and with the increased level of stress and fear in her life, I'd try not to make a big deal out of this. Let her clean up as much as she can with your help and move on as if she isn't fully potty trained. I would be sure she had lots of extra cuddling and rocking time to help with her security level. Once she feels secure again that she isn't going back and will be with you, this behavior should solve itself.

I know it is frustrating and a pain to deal with but little people have a harder time telling us about all the stress they are going through. The behavior is a symptom of her fear/anger.