She looks very strikingly like a true Ameraucana. It's a real possibility that she's an EE, after all Ameraucanas are hardly an old breed and EEs are their progenitors, but if I had to guess I would say she looks more like an Am than an EE. Additionally, many birds are sometimes crossed out for diversity. To "be" a breed they need only meet the standard and breed true. This bird looks like they come close to the standard, though the latter is yet to be seen. It's not like dogs where they need a long, unbroken genetic line that's registered to "be" a breed.
The dark slate legs tend to be a little paler on these lighter colored Ameraucanas. I got a bunch of less-than-steller purebred wheaten Ameraucanas this past spring and their legs are pearly, almost white. So I would say her legs look plenty dark to me.
Having said that I'm not seeing any of the characteristic black markings of a wheaten and her color is a little light for a buff IMO but she could be buff or wheaten just not well bred. Just because an Am isn't well-bred doesn't mean it's an EE.
Ultimately, unless you're going to breed her it's not a big deal. But I would feel very confident referring to this bird as a proper Ameraucana, not an EE.
