I am guessing, since she is only 56 and younger than half the other Big 12 coaches, that she is not voluntarily retiring and is being pushed out. Guessing she might still want to coach but only at Oklahoma so this is dignified way for both parties to end her time at Oklahoma.
Her contract runs through 2024.
Oklahoma coach Sherri Coale retires
After 25 years — the last three out of the NCAA Tournament — the person who saved Oklahoma women's basketball and took it to unprecedented heights is stepping down
www.si.com
Last June, Coale agreed to a contract extension through June 30, 2024. Her most recent salary was $1.33 million.