It appears Avis may have a gap between her top incisors, from what I can tell of the photo. Though it could just be the quality of the photo itself.
What are the chances of Avis having dental records out there? I'm thinking that would be the only way to to rule her in or out at this point. Last I knew, this set of remains was still not located, so there's no way to get a DNA sample from them.
A good smiling photo showing Avis's adult teeth might work, too. Some ME's in CA will use them for ID purposes, not sure about AZ, though.