That's the problem: the casting called for actors to be based in Atlanta, meaning, they don't want actors having the commute to work. They want them IN Atlanta for shooting purposes (per TV Insider: "All roles are contract players and must be Atlanta residents. The show is set to commence taping in November.") So, if she did take a role and did not relocate, it may be a guest/recurring one. None of the Steve Burton treatment (The Young and the Restless). They want their actors local for access purposes.
And per her own admission, Morgan wanted to spend more time with her family following tragedies and COVID. Could her mind have changed? Possibly, but is also could not have.