One of the 'tells' of mental illness in airplane passenger stories is business class. People experiencing manic episodes tend to take luxury options regardless of means.
It really sucks, and I'm sure red flags were present in the terminal if anyone paid attention.
On the plus side, she was probably hospitalized after the emergency landing, she may not be liable.
I've worked an ER servicing a major airport for years, I've seen tons of people like this lady come through. The vast majority of berzerk passenger syoroes involve first or business class passengers. That statement comes feom experience. 'Maybe's are like assholes, everyone has them.