So I contacted the lady. She was breeding olive eggers and black copper marans. They were identified by the lack of leg feathering, since their combs resembled a modified pea. Hers all possess wattles and no beards/muffs. She would be an F2 olive egger. The lady offered to buy her back or trade for a bcm. I told her that I was happy that I ended up with one and solved the mystery.
This is her second egg next to my easter egger, bcm and buff orpington egg.
easter has already been in the air! lucky you