Australorp or some other black chicken?

[SANDSZOO]

Hello, I aquirred a hen 6-7 years old. By description she looks like a Australorp except a few feathers at the base of her head are slightly brown. I am not sure a picture would show the color, but I will try on a later post. Any ideas... I have looked at Black sex link, she is mostly black.
Thank you

 

[Birdlife99]

Does she have a greenish tinge when she is in the sunlight? If so I would say an australorp.