Kit,
I'm sorry for your loss. But the fact that you're here, probably means that you already know that its not so much a loss as just a moving from one place to another. And so long as you are here I'm sure she will come visit you now and then.
I do however believe that CP is correct, I don't think that's an orb. I think its likely lense flare or dust. I'm leaning more to lens flare due to the bright areas in the photograph.
Know this though, that just because you don't see the evidence in a photograph, does not mean that she was not there with you. Most spirits do not have the power or knowledge to manifest enough power to appear in a photograph or EVP. And hopefully she crossed shortly after her passing, but you may sense her from time to time just in the form of a warm feeling, a smell, a touch. And her love remains in your heart forever.