To dream that a doll comes to life indicates that you wish to take on a different persona. You envy someone else because they don't seem to have the same responsibilities and troubles that you have.
To dream about a doll suggests simple purity, as you had in your youth, and simple enjoyments.
To dream about playing with a doll indicates that your mind, the conscious and subconscious, are not in synch. You could also have a poor underdeveloped sense of the opposite sex.