I would also suggest she settle in for the long haul
She will be unlikely to wake up her husband in a month. This would have to be a well planned exit, starting with self education and months of planning. Then the dropping little bits and asking the awkward questions gently gently.
that would be my approach at any rate...I wish your friend well, she is in a good place here, the advice i got when i joined was huge in helping me reach my teenagers with TTATT
Oz