Frazzemrat1
Free Ranging
Have you looked at the Midnight Majesty Marans? They're offered from Hoover's Hatchery and they're a cross breed/hybrid. In my opinion, this is a possibility of what she is. I have one but she's not shown any copper/brown leakage yet but she's still young. I absolutely adore my MMM. She's one of my favorites.
MMM is just a marans' mix. Kinda like what Hatcheries have done with their Americana. They have multiple colors of marans and just let them breed, so they're marans, just not a breed specific color. They did the same with ameraucana, still call them Americana... but because they don't stay to breed standard their ee.