Dealing with a Toxic Stepmother

So I'm trying to work out some emotions towards my venomous stepmother, she's always mean and lies right to people's faces if it makes her look good and has my father in a toxic relationship where he has to, do what she likes when she's around but is a completely different person. She's a hanna barbera villian as a real person with her little henchling that mooches off of them I hate her, but at times I feel unjustified