So the spoiler Hubby stepped in and told her daughter that he will buy her any toy she likes if she will be able to remove her undies everytime she pees or poop.
You know what? It worked!
We survived 2 days with dry undies. What a relief! I just don’t know if I’ll thank or reprimand the Hubby for this accomplishment. But this reward thing surely worked for us! ^_^