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Olive Eggers are crossed from CMs or Welsummers only. She is an EE.
According to whom? EEs and OEs are mutts there is no standard definition that excludes the use of brown egg layers other than those laying dark brown eggs from the breeding of OEs. The depth of brown egg color determines the depth of the olive egg color, but a light brown depth does not necessarily exclude the egg from being an Olive Egg. There are a number of BYCers who have, in fact, experimented with creating just that -- a light olive egg.
The bird could absolutely be a cross between a pure Ameraucana and an Australorp making it an EE. Generally breeders of pure Ameraucanas are not that irresponsible with their birds simply because of the rare nature of the birds themselves. That combined with the depth of color of the green is why I suspect it's a second generation brown egg cross, which by most standards people would consider an OE, not and EE. Semantics, at any rate, given that both are mutts without any real standard definition as to what is and is not acceptable to have crossed in.
So there you have it. She's a mutt.