DD was 2 in December and has always (give or take) gone down to bed really well. She went into a big girl single bed in her new bedroom (to make way for baby in April) the week before Christmas. This went off without much fuss. Did pick up put down maybe 4-5 times on the first night and from then on she got the idea. She carried on having naps in the cot though but I have been training her to go in the bed for the nap. Yesterday she went down for the nap really well. When it came to night bedtime, she wouldn't go down. Cried when we left the room and kept getting up and crying/screaming when put down. Eventually we all went to bed together at 10.30pm. The same thing happened at nap time today and is happening now. DH is just putting her back now. What has suddenly happened to her? HELP!!!