honestly, i'd say she's not sfh, if the others were from the same parents... she's got pink skin under the black/grey, while most sfh would have yellow legs sometimes showing a bit of grey/mottling. pink is NOT a desired trait, since it's a dominant one. it would soon overtake an average flock in a matter of a couple generations IMO.. even her posture in the pics doesn't look like the sfh i've seen (or her sibs). now that might just be the photos, but i'd dare say she's going to be solid black with no mottling. most blacks i'v ehad did have some white as chicks but the next moult they're gone. if she IS sfh, she should moult out with more white feathers. but personally, with those pink feet, i wouldn't breed her with sfh... if she's pure white skin (pink) then 100% of her offspring bred with a yellow legged roo, would give you pink feet... if she's NOT pure, then you get 50/50... if you breed heterozygous pink skinned birds to each other, you'll get roughly 75% pink skin, 25% yellow... so you see the tendency of pink skin to head toward overtaking a whole flock quite easily. IMO any pink legs/feet need to be left out and concentrate on yellow legs, with or without the grey shading/mottling, but YELLOW based.