Sakata is still a young girl that hasn't been involved with ogres she just knows from third parties that ogres are bad. I am sure that once she gets to know Hinata properly, she will become a strong ally.
it's not just she "known" ogres from a third party. She's been taught her entire life that ogres are bad, it's basically brainwashing at this point, and unless some major shit happens, she won't change her mind about ogres. Even if she does get to know Hinata, she'd just think it's a rare case among ogres.
personally, even though I understand why she is the way she is, I still don't like characters like her and fuck I was disappointed to see her in this chapter. I honestly wish she could just grow the fck out of the "ogres are bad human are good" mindset already, or at least form some opinion of her own instead of believing whatever she's taught.
anw, thanks for the chapter.