My daughter is 2.5 years old. We've tried a lot to toilet train her. She only tells us when she needs to pee and goes to the washroom, but she doesn't go to the toilet for potty. She only poops in her diaper. If we don't put a diaper on her all day, she'll hold her poop all day, even if she really needs to go. She holds it even when we take her to the toilet. But as soon as I put a diaper on her, she immediately poops. I don't understand how to toilet train her.