2.6 year old dd. Knows exactly when she wants to do wee or poo and can hold on for ages. Refuses to use potty or toilet, but asks for nappy and then does said wee or poo. Half-hearted go at weeing in her nappy spread over the potty a couple of times, but she's not keen on it. Shall I don her 'not ready' and leave it a few weeks?