The story lacks detail of what the medical concern was and if an FAA-recognized medical examiner was involved.
No info on what the FAA’s ongoing concern was, Wikipedia covers aspects of IUDs and describes two different kinds with different chemistry.
(And I note that medicines are used for various things, not necessary the main usage that is popularly known. There’s a term for that, perhaps ‘off-???’.
The FAA’s concern with depression, probably not her case, is that depressed people tend to jump into action when recovering and might act irrationally. How likely is that for a pilot supposedly trained and perhaps experienced in risk?