So, barring a miracle, Kaitlyn Dever won’t be around in person like she was for her lone Season 9 episode “The Two Nieces of Eve,” which itself almost didn’t happen for one reason or twelve others.
However, Dever may very well show up in the series finale via Zoom call or in some other prerecorded way.
Alternately, it’s possible Dever and the producers banked on her not being able to return, and that they filmed something extra with her while she was still on the set, just probably not in character.
In that sense, it wouldn’t be far off from how Dever’s Eve appeared on a video call in Season 9’s premiere, which introduced the big time jump, which showrunner Kevin Abbot might have handled differently in hindsight.