Not sure the exact number but heard it is between $300 -500K. Sky's $58K is a joke.
I believe Gabby's WNBA salary is actually $70,040. That's what Her Hoop Stats has and they generally have the best update WNBA salary info:
Chicago Sky WNBA Salary Cap Sheet
But yeah, probably significantly less than what she made playing for Sopron.
I don't think this is about Gabby sitting out over money, though. The rumor I heard was that she was talking with the team about whether she would join the team after the Olympics or not. Then came the draft night news that the Sky were shopping her on the trade market, which soured the relationship.
Ultimately, I think the Sky were reluctant to carry a player that would miss a large chunk of the season. Also, she is set to become a free agent after the offseason and the Sky probably don't have money to resign her. Vandersloot, Quigley, DeShields and Copper are all hitting free agency after this year and are all bigger priorities than Gabby. And they probably don't have money to sign all four of that group anyway.
Sadly, the Sky don't really have incentive to keep Gabby happy because they know that they are losing her at the end of the season.
The big beneficiary of all of this is probably Lexie Brown who now has a clear path to a backup wing spot with Gabby out of the picture. Natasha Mack and Brittany Boyd are also in the picture for the final Sky roster spot.