Mother is 76 and has alienated everyone in the family. We support her financially but it's her way or the highway. She has no filter and when she lashes out she makes up stories so it's always the other persons fault. When you try to reason with her she becomes angry, irrational and frequently play the "i want to die card". She spends her time rehashing old fueds and the only one who isn't in her crosshairs is the person she's talking to. This behavior started about 5 years ago and we don't know what to do. Help!
It sounds like Mother has dementia or a similar disorder. If true, she can't help that. There are treatments that can help the symptoms, however. Also learning what is wrong can help you learn how best to cope.
It is entirely possible that once you have a diagnosis you will still want her out of your home. Nothing wrong with that -- but with a diagnosis you'll be better able to figure out where she should go.
I think your first step should be to try to figure out what has caused her to lose all her filters and become irrational.