I have 1 RIR ROO, 1 Easter Egger Roo, 1 Plymouth Barred rock, 4 Jersey, 2 RIW, 2 Marans, I also have a small flock of Bantam silkies but I don't foresee them having much to do with it LOL
I had originally though Easter egger but the feet and leg feathers are confusing me
Could there be some French Maran blood in your Marans? They have feathered feet. The eye stripes are common in Easter Egger chicks. I am betting she is an EE/Marans cross.