What genes are at play as far as y'all can tell?
Black ends on the chest feathers,
And lovely penciling/maybe double lacing on the side and shoulder feathers?
What type comb does she have ? That could help identify the mix . She looks kind or dark red in the face . Could be a clue .
I would guess Swedish Flower . Polish have a V comb . I see no sign of that .
Partridge Brahma is double laced on the female . She had a gold/red dad as gold and silver are sex linked . Females can not be both so her dad was red/gold .
They use Leghorns to create this mixed breed. It's dominant white, not silver, but there could be silver under the white. Not recommended for sexlink breedings though.
You can not use white leghrons to make silver/gold sex linked chickens. The genetics of the white leghron is all wrong for the cross. You could use a bird like a delaware female and a RIR male.