New The Biggest Loser trainer Anna Kournikova won’t return to the show next season, reportedly because she was difficult to work with. That news comes less than six months after she was added to the show to replace Jillian Michaels, though ratings have dropped without Jillian.

The Hollywood Reporter says that show “staffers say they clashed with [Kournikova], and some of the contestants found her a bit brash. Whereas Michaels was soothing, encouraging and even uplifting, Kournikova did not sympathize with her overweight contestants, often telling them about her own tough upbringing when they complained about training being hard. A source on the show actually called Kournikova ‘a nightmare.'”

In a predictably generic statement to the paper, she said, “I enjoyed my time on the Biggest Loser ranch. Although I will not be returning as a full time trainer on season 13, I will always be a part of The Biggest Loser family and my commitment to bettering lives through health and fitness will continue.”