Carinne Roitfeld and the sudden departure from French Vogue

The rumour mill is seldom ever still and the sudden departure of French Vogue editor Carine Roitfeld was bound to set it turning. Largely tipped to replace Anna Wintour- which I didn't forsee for a long time to come- at US Vogue (he magazine's most influential edition), why would Carine suddenly leave?
For those who don't know, Carine has been one of the world's most controversial fashion mag editors, recently making headlines for an oil-spill themed spread (after the whole BP debacle) and painting white models black before that. Her genius did, at times, land her in hot water.
Read the following extract from Telegraph UK:

"Although Roitfeld officially resigned, saying that she wanted to concentrate on personal projects, rumours have been buzzing around the internet that she was forced to leave for a variety of different reasons. One theory is that LVMH boss Bernard Arnault was so incensed by a shoot featuring young girls wearing full make-up in a recent issue, that he threatened to pull all the advertising of his brands. Other insiders claim that Roitfeld was spending too much time on freelance ventures, which would square with Romatet's statement that Emmanuelle Alt would be working exclusively with the magazine."