It would be ridiculous to have this happen because of Solo. It would be a completely asinine move. The defacto rationalization would be you keep your job until one film doesn't do what it's supposed to, then you're toast. No one would take the job if that's the case.
Now, if she's sick of the fan BS (the out of line stuff, not the legit stuff - or even the legit stuff frankly), that's fine. It is possible to have had enough. She goes back a ways too, so maybe she just wants to retire. Who knows. Hopefully it's that. If this is a disney move due to solo, they should be ashamed.