the distinction in meaning between 'dollgirl' and 'doll'? well, it's very simple. [fails to elaborate]
You see, "dollgirl" is a girl who is a doll, or perhaps a doll who is a girl. Those are different by the way. However, a "doll" is what a real hardboiled private eye calls a nice dame who's sweet as peaches and lacks the lips that could kill a man that would reclassify said dame as trouble.