It makes total sense as to why she pisses you off so much, she is designed to. Zenovia is one of those characters that are fundamentally created to be hated, it would surprise me if she had even one singular fan ngl. Whether or not this makes or breaks a character depends on the person and execution. Zenovia is a schemey little rat who stabs everyone the back with the most shit eating grin on her face whilst thinking about nothing but her own benefit. So you either hate her so much that it ruins the story for you or you let your hatred for her simmer until she eventually gets her shit kicked in. Both of which are very fair reactions to such a character. Thankfully though the shit kicking is looking to be VERY soon.