I haven't seen it from an authoritative source, but my guess is that Geno got Z to agree to stay for 2 years. That's part of why I think she may not start this season (though she will play major minutes).
After the Italy trip, Geno put the players into categories (I'm paraphrasing):
Kia, Gabby, Lou, and Pheesa knew what they were doing, played very well, and know they still have to improve even more.
Crystal and Azura were good/very good a times, but inconsistent, and have more room for improvement than the Core 4.
Batouly, Molly, and Kyla are further down, but at least know what Geno wants.
The freshmen have a long way to go, though Meg got lots of PT. Geno will give her opportunities, but point out how much she has to learn.
The relevant point here is that Geno grouped Azura with Crystal and not with the Core 4. She has NPOY potential in one of the next two years, but Geno sees much room for improvement (as in 2 years worth in Storrs).