Thanks Yogababy,

I had a feeling it was probably separation anxiety. I don't mind standing at her cot, she is so lovely when she is asleep (aren't they all?!?!?), but I am worreid that it will become habit rather than necessity, and I can't have it this way with twins on board.
As you say, I will give it a few more weeks then try to 'wean her off it' so to speak. FIngers crossed.

Julesy