Well, it's only Sky news so can't vouch for accuracy but it says;
'Despite reacting to her defeat modestly on screen, there were reports she had run amok backstage after the contest, screaming: "I hate this show."
Boyle, from Blackburn, West Lothian, is accused of swearing and throwing a cup of water over a floor manager who tried to calm her down.
This morning a Met spokeswoman told Sky News that police had been called at around 6pm last night to a central London hotel.
Doctors had been assessing a woman under the Mental Health Act at the hotel, and a decision was made to voluntarily take her to a clinic, the spokeswoman said.'
Could be much more to it though, like Hecate says. But if so then it's probably a good thing it's not being reported in lots of gory detail.