Unfortunately, you can't help someone who doesn't want help, because as you've seen, she's not getting better as long as she refuses help. However (!), you can always continue extend your hand, saying you're there if she needs you. Offering support can help people with mental illness, but at the same time, there is a fine line between abusive behavior and behavior that arises from a mental illness.

Maybe I'm wrong, but I've never seen "blaming" or "lying" as symptoms of bipolar, schizophrenia, or schizoaffective. (I'm not saying you're saying they're symptoms, but I think they fall under abusive behavior and likely have nothing to do with her mental illness. Sure, she could be frustrated and that frustration is let out that way, but I would call it a personality issue, and it's not fair to you or anyone else around you to get abused.)