That could well be a Langshan Pullet, the comb is far too small for a Langshan cockerel that age, still young and appears the tail is either in molt or very short. Langshan Cockerels and Cocks have very nice large tail sets, If it has a "bunny tail" it is not a Langshan but may be partially, The bird is definitely not Cochin as they should be as wide as tall and nearly round in appearance.
How many toes have feathers? Just the outer Toe? If so could be Langshan, Langshan Cross or Cochin Cross with some other large breed.