My suspicion is that she was discernible all the way to 8 November. That morning of 8 November...she was a different person from that point on.
Go look around, there are hundreds of thousands of people who can’t function as of 8 November. Their behavior makes them a problem. There are women married to 8 November husbands, and unable to move forward. There are guys married to 8 November women, who are permanently questioning their reliability.
I mean, she is incapable of discernment... as in 'completely lacking' the experience, intellectual means or maturity to assess things properly and reach 'reasoned', valid conclusions or to make sound decisions.