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I have never seen or heard of this and my parents have been doing black copper and blue copper marans for a few years now. Where have you heard that a marans could be a rose comb? As far as I know they only come in single comb.You didn't mention how old she is, but the comb looks pretty small. Is it a rose comb? BCM can have rose combs while a Black Star/Black Sex Link have large single combs.
Lady of McCamley
What do you mean crown? in my experience the pullet's comb will stay shorter until they get older and in one of my lines the pullet comb is dark kinda black until older... if you post pics we could help you better decide what the chick is...