she mentioned Splash! and said that she'd never lower herself to do a show like that. As the only person who has appeared in both shows is Jade, it's blindingly obvious who Rita was referring to.
Rita seems to be a) assuming that she'd have won the Eurovision selection show if she hadn't walked away after her audition and b) assuming that now she's successful, she will always enjoy the same level of success. Silly girl.
Oh right, I've just read the Rita article again to see how she made digs at Jade, but Jade does push it with her comments back.