Yes why!!!???? My DD whos 28 months soon has comepletly stopped and throws a fit if I even dare ask her if she needs to go! she hides and does her business without telling me now! Whats up with this!??
Usually it is caused by stress. Is there something going on in the family that could subconsiously be upsetting her? Like mommy and daddy arguing around her. Or does she have a new baby brother or sister? Those are suggestions. It could be something else.