Well there is more than one difference between them but one is ameraucanas have slate legs and EEs have green or yellow legs. Ameraucanas lay blue eggs, EEs lay blue, green , or pink eggs. There are 8 colors aceppted as ameraucanas (blue,black,white,buff,brown red, wheaten, and blue wheaten). Ameraucanas have beard and EEs are supposed to but they dont always (Ihave one that is beardless). Ameraucanas have pea combs and so are EEs, but they dont always (I have one with a single comb.
So you are right and wrong. Her legs being a slate color would make her one step closer to being a true ameraucana, but other things such as feather color would also have to be different for her to be a true ameraucana.