2.4 year old daughter. Wee's fine on potty and for a week has pooed a couple of times on it. For the last two days she has clearly needed to poo but has started to look terrified and shriek as its coming out and scream even louder when I try to sit her on the potty. She asks for her nappy and is in a right old state. Her poo isn't hard, it isn't that she's in pain she just seems scared?! This is for no reason at all nothing has happened and I don't force her I just put the potty near her and she goes ballistic. Why?! What should I do??