Clearly she has a great deal of untreated or inadequately treated mental illness. But it sounds like she is living a life that is bringing her happiness.
Duvall became a lost talent mostly after the 70's. Such a shame, because she is such a unique one of a kind.
There are still a few films of hers I need to see, but my favourite of what I have is 3 Women - 77'. The entire film is terrific and in my top 10 from the 70's decade.