you are allowed to hate me for this but before you do let me give the reasons.
her behavior toward Rachel was unacceptable:
She was extremely rude and disrespectful to her even going as far to make underlined threats.
She fails to realize Percy is a person: in general she is just very verbally abusive at least in the first series. In the second series she judo flipped him for something that wasn't even his fault.
She is way too prideful and that is what landed her in tarturus:
Her fatal flaw is pride. She literally didn't answer the sphinx question because she thought she was too smart. Talk about superiority complex! Also she was too busy bragging about arachne to realize she was caught in her web putting herself and everyone else in danger if I was Percy I would let her fall. At least his fatal flaw is good for something.
Those are just some of the many reasons I don't like her. Hate me! I don't care.