I've been writing and revising my reply for quite a while now, so I'll just cut to the chase. It looks to me like Gail is breaking Diana down so she can bring her back up again. There is sense in this; no building can last if it is supported on a poor edifice, and I think we can all agree that the Heinberg/Shamazons mess is a very poor edifice indeed. Gail has destroyed that edifice so she can rebuild anew. She's doing for Wonder Woman what the Murderer/Fugitive storyline was supposed to do for Batman: destroy the faulty edifice and build something better.
Of course, M/F was a long crossover that consumed the Batbooks for months. There's only one WW title, so this will take some time to complete.