Regardless..
Its the Captains responsibility, its his job to make sure the flight operates safely.. And when u have a person, crew or not, acting this why they must be removed.. people acting crazy for any reason needs to be removed.. ITS FAR's. and to further the irresponsibility they allowed her to board the next day as a crew member.. Why is it people can't follow the rules. People die when people don't follow the rules..
The girl needs help and I hope she gets it. But not on my flight. Take her to where she needs to be.. In a hospital. Not a working crew member. They have good hospitals in FRA.