She is an Easter Egger (if indeed I am seeing muffs on her cheeks). That is a hybrid (mix) of Ameraucana and any other breed, usually a brown layer type, to produce light green eggs. If the line is not well controlled, the blue shell gene is quickly bred out resulting in birds that lay white, or brown, or tan, depending on the genetics for brown wash, and will have single combs. *Typically* Easter Eggers from Ameraucana parentage (at least close enough back to matter) will have muffs (cheek fluff), pea comb, and often green legs but may have yellow or another color. If from a careful line, they will lay light greenish eggs but will not breed true.
Ameraucana, (spelled with au never an i), are a very specific breed type that has pea comb, about 7 standard colors, grey/slate legs, and will breed pure for blue shell eggs. To get an Ameraucana, you need to go to a reliable breeder. Many hatcheries claim to have Ameraucanas, and will misspell it Americana, but what they actually have are the much cheaper Easter Egger.
Olive Egger is another hybrid (mix) between a blue shell layer parent and a dark brown layer parent. Often Ameraucana is on one side while Welsummer, Barnevelder, or Marans are on the other side. However, other breeds that lay blue eggs can be used, or even with a proven Easter Egger. I create my Olive Eggers with Cream Legbars for the blue shell gene side over Barnevelder (for the dark brown wash).
HTH.
Pretty girl. Enjoy her.
LofMc