How old is she? Could be a Sumatra. They have almost non-existent combs like yours does. Also can have a green-ish sheen like yours.
Depending on the age, she's probably a Black Australorp, Jersey Giant, or Black Sumatra. Does she have a single or a pea comb?? If pea, then the Sumatra is probably the one. http://www.feathersite.com/Poultry///CGP/Sumatra/BRKSumatras.html
looks like a black australorp to me. i have 1 and her feathers have a greenish tint to them in the sun and her skin around her face is very red.
looks like one of our black sumatra's but there are other breeds it could such as jg and blk australorp
does it have a flat bumpy comb or a straight sawtooth line? Sumatra's have pea combs and austrolorp have single combs
She has the body and feet of my Jersey Giants. My hens that are that big have much bigger combs. She has a game type face, may be where the sumatra ideas come from.