Are you kidding me? How does pushing him to the brink of despair make sense if she seemingly enjoys being looked down on? Is she just angry at herself for feeling this way, so she wanted to stop him from ever being able to do it again?
So y'know that too-common thing with celebs n' politicians? Those types who are super anti-LGBTQ or whatnot, only for it to be found out they have some same-sex affair on the side?
More or less the same thing. She's a naturally talented and socially adept girl who, from a young age, has been able to do just about anything she sets her mind to and wrap anyone she wants around her finger. So when Uichi turned her down- when she was denied something she believed she was entitled to- that woke up a feeling inside her that she either couldn't understand or didn't
want to understand, and so she decided that the best way for her to turn "back to normal" was to crush Uichi, make her fall for him, then smack him down. The way things "should" have happened.
She gets thrilled when things don't go her way or when she gets knocked down a peg because it's a sense of adversity and struggle, a loss of the control that's become the norm for her. And yes, she
hates feeling that way, because she's so narcissistic and full of herself. It's a clash between her pride in herself and her image and the pleasure she gets from being denied, a kink she has been desperately trying to repress. But now Uichi's newfound assertiveness and utter refusal to give her the attention she's so used to getting has opened up that door in full.
So... yes. Like a closeted politician raging against gay rights out of self-loathing at their own repressed orientation, her obsession with tearing down Uichi is rooted in the fact that she's been desperately trying to deny her masochistic tendencies that Uichi and Yotsuha have both stirred up within her.