omg i am in exactly the same boat...she's been with me a month and is 12mths old. she will play with the others but once she hits tired, hungry, cranky whatever...she is inconsolable and loud. She is fine if I hold her. She is usually happy and ok till about 11, then the rest of the day is more or less a write off. my whole routine has been off since she started ( which I expect in the beginning but it has been a full month now)