Sneeks showed more rebellious nature but also the cunning to survive with divination. It's one thing when other kids attempts on attacking her fail, but when the matron Vicodriila Do'Val Lorrainias sends someone to give her a reality check and they FAIL. Now that's too much power.
What's more, Xu'Nirra Do'Val Lorranians was a total brat queen. Between her brattiness growing up, and obscene foresight, she was practically a copycat of Vicodriila Do'Val Lorrainias herself. And as a narcissist, if there's one thing she can't stand, it's a living copycat. Plus, Vicodriila just likes to own nice things that people have. And there is nothing wrong with that. OBVIOUSLY.