She's certainly a pretty color, I'm just not sure she's pure anything. The comb looks wrinkly to me, often a sign of mixed breeding somewhere in the gene pool. Is she laying, and if so what color eggs? my best guess for a pure breed would be a marans. she's too heavy to be an Andalusian, and no white earlobe. Wrong body shape to be an Orpington. The dark legs make me question if she's mixed also--I'm not sure what color legs blue Marans are supposed to have.