No reason to lose data. Simply create a current image, then restore an
older image, followed by bringing the current data back in.
OTOH, if she does feed G Mulcaster to the dogs, can I have a ticket to
the show?
No, G, I am not serious about that. But I am serious about agreeing with
Char Jackson's suggestion.
Back to Alexander Arnakis's advice - when you use the F8 screen and
choose "Repair Your Computer", there are other options, some of which
take forever, but sometimes work. They are scary, because your computer
looks like it is dead for as much as a half hour, but this repair option
can work (I am repeating myself, but only for emphasis).
I forget what the choices are, but if you look you can try to guess what
to do.