I'd say if Coco is happy in there playing, just leave her there and see how she goes. She may well have a little play by herself and then put herself to sleep. I'd stick with whatever sleep cues you have been giving her as she knows what they mean, but just leave her and see what happens.

We would do this to Jacob and honestly at times he'd prattle on for ages, but then he'd go quiet and fall asleep! If he started to get upset though, we'd go straight in and start on our settling techniques with him.

He's a different kettle of fish these days mind you!