...Okay, not bad, not bad. As far as schemes go, I can appreciate the cleverness put into this one. She's being stubborn about her outfit, which isn't earning points, but it looks like her goal isn't to earn points but to beat down her sister, who she sees as an extreme rival. It feels like something Su Luxia would do.
That said, something Su Luxia would also do is teach her son how to dodge these sorts of techniques, and our boy hasn't disappointed us so far.
I love how it's such a given that he's a mamacon.