Well, it should be clear by now that Quattro is a huge bitch. At times she seems worse than the Doctor because she's more sadistic by far. She denounces her sisters (Wendi, Deici, Sein and especially Cinque, who everyone else seems to love), loves to torture Vivio, and lacks the respect for Lutecia and Fate that the others seem to have.

Her IS is illusion based, so she could be messing with Vivio's perception in a similar way to how she's controlling Lulu.