No, what Sheyla truly disliked about the man was that her brother mistook him for a real hero. She feared that because of him, Ogoro would try again his foolish, childish, idiotic idea of becoming a damn useless hero.
And once that big oaf set his mind on doing something, he would see it through to the end. Ogoro was that stubborn of a person.
Sheyla had thought about resolving the problem by just outright killing the black challenger. However, she hadn't done so for two reasons.
First, he had saved her life, and even if she hated to admit it, she felt grateful for that. On top of that, there was that teaching about a life for a life the Ryu household had ingrained in their brain. That's the main reason she had accepted to accompany Ogoro to help the black challenger.