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She looks like peahens I got out of crosses with silver pied. For reasons I don't know why, they didn't really get much of the silvery/grey color like on white eyes(that were not out of silver pied). More like a lighter shade of brown than IB and have less of the sugar frosted look.
To answer your question, I would guess your hen is basically split for silver pied. If you bred her with silver pied or whites out of silver pied, probably would get a couple silver pied chicks.
My first white eyes came directly from Ernie West who I understood was the discoverer of the white eye and Frances Ray(iirc, they got from West also?). All of them were exactly like chickenzoo's hen, I outcrossed them with whites, blues etc and they also came out silvery grey with heavy 'frosting'.
Many years later, got a silver pied peacock and crossed them with whites and white eyeds.. the result were hens just like yours- more like a lighter brown with less frosting(compared to my original WE). I don't know why.. silver pieds are supposed to be all white eyed also, therefore all offspring should be "white eyed". my tentative guess is silver pied maybe have something different but this is a complete guess.
Even the chicks looked distinct from each other.. the original white eyed chicks were same as IB except they look faded, much like jeans washed countless times. The non-pied chicks from silver pied crosses all had very yellow head, neck, belly and lighter tan on back and wings than IB.