Shania Twain's secretary and house manager is slamming people.com's report that she split up the country singer's 14-year marriage to producer Mutt Lange.

When contacted by E! News at her home in Geneva, Marie-Anne Thiébaud admitted, "I know what you're ringing to ask me about. But, when marriages break up they break up for all sorts of complicated reasons, it's never just one reason. And those reasons should be kept private.

"If you're looking for a person that broke up a marriage then you have the wrong person. I'm not that person," she added.

Thiébaud, 37 —who said she no longer works for the pair and is retired — declined to comment any further on the report, asking that the press not "intrude into people's private lives."

Twain, 42, and Lange, 59, announced their split on May 15.

They have a son, Eja D'Angelo, 6.