This is sad news, but expected. Just got this note from Peter Yarrow:

Surrounded by love with a spirit of quiet, grateful, celebration amongst
many friends who had gathered to be with her, Mary chose to leave us a few
minutes before 7:30 pm, this evening.

She was in no pain and was able to understand and respond to spoken words
even up to some time late in the afternoon, just a few hours before her
pasing.

I was able to convey the thoughts, messages of appreciation and love, from
many of you who contacted me.

It was an honor and a blessing to have been with Mary in this last, powerful
chapter in her life. She was Mary to a "T" until the end, nodding yesterday
when asked if she wanted to go shopping with the girls at the Mall, gently
(but clearly) slapping away the arm of a nurse who didn't stop doing
something to Mary when she asked her not to (all this with her eyes
unopened). I could sense her delight when I came to sit with her, massage
her fingers as I always did on tour, and tell her all the things worth
saying to express my love, for quite a long period of time during the day.

She was a giant of a person, in spirit and heart, till the end. Missing her
has only just begun.

Love to you all,

Peter