Unknown chicken breed

[Bella204]

This is my 20 week old hen Ruby, I raised her from an egg but have no idea what breed she is. I did have a quick look online, but didnt find anything identical to her. She was born a black chick, then developed the orange feathers as she grew up. Thank you for your help!

 

[JedJackson]

Where did the egg come from? If it was from a backyard, mixed flock then she is likely a mixed breed. If it came from a hatchery, then she's a black sex link.

 

[Bella204]

Where did the egg come from? If it was from a backyard, mixed flock then she is likely a mixed breed. If it came from a hatchery, then she's a black sex link.

I got 6 eggs to hatch for my reception class at school through incredibleeggs.co.uk so I'm not sure sorry, but 4 of the eggs were not crossbreeds (2 bluebelles, a cream legbar, a sussex white) and then the there was ruby and another black chick with white spot, and we were told he was a boy so then they probably are black sex links.
Thank you!

 

[Chickem707]

She looks a bit like my French BCM, he has that blue-green sheen too.

 

[Crazy for Chickens!]

Black Sex Link

Look them up, there are tons of pictures!