I saw Peggy perform quite recently - just before Xmas - and she was exquisite.
I thought her singing had improved! - in a way not so "whiney". She played concertina, autoharp, guitar and banjo, and electric piano once or possibly twice. She also sang unaccompanied. She sang a mixture of self-penned and unaccompanied American traditional songs. A fairly normal performance I would have said and certainly different from her last tour of the UK in her choice of material.
Let us remember she is 70 years old - 71 shortly June I think. She tours all over the world still.
And she says she has been lucky to meet two wonderful life partners in one lifetime. Seems about right to me.