Yeah I don’t know the particulars
I would say anyone going to see her hopefully is doing so out of love - to be in her presence-and not expecting much in terms of performance. As far as playing live for Joni, it might be an attempt to aid her recuperation but I don’t know the particulars.
I saw her in the late 90s -twice- and it wasn’t the show I was hoping to see which would have been her solo circa Blue era. How could it be? I just never got into her jazzier mid to late 70s stuff that so many rave about.