I just started potty training my 3 year old a week ago. And she has only had 3 accidents and has been doing great. But today she won't get off the potty and as soon as she gets off she starts crying saying she still has to go potty but does nothing. She is fine while she is in the potty she is happy and playful but as soon as you take her off she wants back on. I don't know what's going on and what to do.