Yeah after looking it up that's probably what she is, I'm going to hatch eggs of hers crossed with a brahma soon would I be able to gender the chicks then if she's a sex link?
I've had her for a few years she's larger than average and lays quite a large egg compared to the others, she's pure black all over except for a bit of red on her neck, in these pics she is standing next to a blue Orpington for a size comparison