She's a high class fishwife
Sharon accused Danii of sleeping with Simon and sucking up to him, which turned out to be true. I don't know how Dani managed to become some sort of underdog darling? She had quite a few moments where she showed herself up. Sharon is quite in your face and you'd know if she had something to say about you but I always got the feeling that Dani, while quieter, is more underhanded.
I've never believed that Dannii was 'bullied' by Sharon either