What breed is my hen? Polish mixed with...?

[Jakrzz]

Hi there,
The photo on my avatar is of my beloved hen, Gracie. I had gotten her from a chicken swap up here in Tilton, Nh. She about 7 months and is laying! What breed is she?! The seller said she was a polish mixed with something she didn't know of.
She lays an olive color, has black feather, black feet and black skin, and a messed up 4 pronged crown
Anyway let me know I'd sure appreciate it!

 

[BantamFan4Life]

Looks like a Crevecouer but it could be a mix with other crested breeds. Could you have a bigger picture of the chicken so I can
look at the crest better that will help in the identification.

 

[ramirezframing]

a full body picture of her side will help, but if she lays olive eggs shes an olive egger