Both?
I think in theory she doesn't hate him. More like she doesn't understand what happen to cassian and why he was put as a traitor. It did show a flashback hinting on how she like her student but just dont want to show it. You know like how those drama go. Master alway love and believe in their students until the end. She probably don't want the villains cassian to used that name and hate only that part probably because she still believes that cassian is not a traitor and still looking for evidence but bc the villains used the name cassian, it is like her student have really become a traitor. Just a theory, not sure if i am right.
soo... does griffith hates cassisn ( the villain) because he's dirtying the name of her student cassian (the psyker) or she really hates cassian (the psyker) because she thinks he is a traitor?