I was always under the impression that Stosur would get it.
If Evie doesnt need it, then obviously the runner up in Queensland (McQuillan) gets Evie's...as McQuillan wont need her South Aussie one, then that will go to the runner up of that leg (Stosur). Im pretty sure thats how it works!
But I want Grahame to get it too, both her and Sam deserve a spot as you said.
Anyway, I still think Evie will need the WC as she is around 3rd on the next in list.