I read this tweet for Federer's exemption the other day, but that's the ATP. So the rules a vastly different from the WTA?
They've had this type of rule in the APT for ages, since at least as far back as when Agassi and Hewitt were in the latter stages of their respective careers. The mandatory aspect of the WTA wasn't even a thing at the time, so I think the whole system is still evolving in the WTA. Undoubtedly the schedule and entry rules will become more and more like the ATP as time goes on.
Entry is automatic, but apparently she has immediately withdrawn.
I don't think she may care about the zero in the ranking and about possible fines, that can be anyway skipped just making some PR activity.
But is Entry automatically in P MAN? or as I post before, some players have their own Rules?