Seems reasonable if the nanny puts him down to sleep and is there to calm him.... she would be the one who would be able to calm him or get him to sleep.  It's not the nanny's problem or the child's problem.

I have had the same feelings but has since realised that I am still his mom and I am making a point to make the bedtime for him a special for us to be together.

i've ben through th same and can completely empathise with u... if u can afford, spend more time with your baby and distance her from the nanny bit by bit... smile at her, play with her and make her enjoy your company..be there for her to comfor her and things will start to turn around! all the best!!