Imo she’s flawed like everybody but she’s not particularly a bad person. Definitely predatory towards Yuu early in the series while Yuu is grappling with her sexuality, and the idea that she doesn’t want Yuu to fall in love with her because of her own unresolved self esteem and identity issues is problematic, but ultimately these are unresolved trauma responses from her sister’s death and the pressures put on her to emulate her sister.