yep - we've just been through this - we moved her to a mattress on the floor up against her wall so we could lie down with her and be a barrier at the same time to get around it but found the same thing after a couple of weeks. Good news is she got over it for the most part and will got to sleep (in a single bed now not the cot) on her own especially through the day, but mostly now I got for a nice evening walk with her in the pram at bedtime after her bottle, and put muslin cloth over the pram and she goes happily to sleep and DH moves her to bed a couple of hours later (at night) through the day just leave her in pram if she's not gone on her own in the bed. Does your DD like the pram?