Green under the wing means she's a green series bird. She looks opaline as well. Can you post some pics of her front with her face? Also, from what I've heard it's not abnormal to have a few blue feathers here and there (someone once told me that means the bird is split to blue, but I don't have any experience with that) and I think I've heard that blue feathers around the vent area can mean the bird carries violet factor. But I don't have any violet factored green birds to have experience with that, either.
Like Amelia said, there no way to know what she's split for unless you know the parentage or breed her.