As of 2016-2017, Joanne Boyle's base salary was $365,792 (it will obviously be greater this year, with yearly increases and a bonus for making the NCAA Tournament). Her contract expires this year.
By comparison, in 2015, Staley had her contract extended and salary raised. Her base pay was raised from $350,000 to $550,000; her contract was extended through 2020-21; and her total compensation package was pushed to $1.1 million, starting with 2015-16. After winning the national title, Staley signed a four-year extension in 2017 that included an increase in base salary to $650,000, and yearly increases in outside compensation (money from athletic department rights holders) that raised her total financial package to $1.4 million in the first year of the extension (2021) and to $2.1 million in the final year (2025). Her buyout increases from $700,000 in her old contract to $3.5 million in the first year of the new deal.
In other words, Virginia would not have to buy out Boyle, as she is in the last year of her contract.
But Virginia would have to pony up a LARGE sum of money to buy out Staley, plus a HUGE package to attract Staley (unless Dawn wants to take a massive pay cut). Not sure UVA Athletics has the money (or the desire) to spend so much money on a non-revenue sport.