She’s not the only one, of course. There have been several high profile cases recently involving people in the public eye being accused of, and sometimes admitting, the same thing.
When I worked for an inner city charity, the organisers were well in touch with what you might call the city underground, and that included the drugs scene. One thing they learned was that there are plenty of establishment figures, celebrities, and so on who routinely use illegal drugs. Drug taking, according to those who should know, is perfectly common among politicians, the police, celebrities, sports stars etc, but for some reason it’s only the ordinary people at the bottom of the social heap who get routinely hounded for it.