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She's cute, but I'm guessing her daddy was an Easter Egger, because there aren't birchen Ameraucanas. Also, according to the online genetics calculator, a birchen roo x white hen would not give you blue chicks. They would give you 50% black patterned silver necked, and 50% black patterned golden necked. BUT since daddy was likely an EE, there's no way to know for sure what all is in his genes. That's really neat though that he's giving you consistent offspring. BUT, again, since you don't know what his genes ARE, there's no way to know how they would combine with other varieties. Now, if she is a TRUE blue (which I don't think she is) and you bred her to a salmon male, you would end up with visually black and blue chicks, when bred to each other would give you solid b/b/s AND salmon/blue salmon/splash salmon chicks.
Leg color and egg color will also be a problem, though the pea comb of the Ameraucanas is associated with the blue egg gene, so if you cull any pea combed chicks, the egg color issue should resolve itself faster...