She did make a mistake. I mean, The Voice UK has done absolutely nothing for Jessie J and Kylie Minogue. Quite the opposite in fact, it damaged Jessie's career and gave Kylie nothing but a flop era.
It would have probably been best to reject both the shows, even though The X Factor would have increased her profile. It's dangerous territory to get into for a singer these days, because we've seen that once the public get too familiar with you as a judge and a television personality, it becomes harder to sell your music when you are no longer on the show and don't have that to back you up.
Nobody uses it here.
Get har.
aka someone far bigger than Rita could ever hope to be.