Not saying she necessarily 100% isnt bipolar, just that her actions at the very least point to a cluster B personality disorder as well.
She might also be bipolar, but so many things can be misdiagnosed as bipolar. Many people with, say, borderline personality disorder get misdiagnosed as bipolar because of the similar mood lability.
So many things can be mistaken for mania- like someone who abuses K-pins regularly or the boredom and need to alleviate it that ASPD individuals face.
Anyways. Not saying for sure that she doesnt have bipolar... just that she also has something else. This isnt really uncommmon. Its almost more uncommon NOT to have a dual diagnosis when you have psychiatric problems. But shes evil, she has no regard for others because she never grew a conscience. Her personality is forever going to be stunted by this- and theres really nothing to be done unless she is willing to go into therapy and learn how to... learn morality without a moral compass
Anyways. Bipolar people are just regular people generally who have issues regulating their mood because of the intensity of the mood swings. They generally arent cruel just naturally, even though they have more chance of acting on their moods and doing things they later regret.
But Susan regrets nothing ever. She has very little to zero empathy for others. And thats just- that involves something beyond just bipolar.
Anyways. Id be really really interested in a forensic psych report on Susan. It probably wont happen but I have a feeling that if it did all the red flags found could fill an entire room