I saw Peter, Paul and Mary perform a few times, and my mom and one of my brothers saw Peter and Paul perform just last month. Mary was not doing well.
As late as the early 90s, they would still join in demonstrations and get arrested, too.
Years back, I remember listening to their version of this song over and over to figure out their harmonies. It's a very pretty rendition, even haunting, expressing great yearning. They popularized some very good and important songs over the years.
Their website has statements and photos. RIP, Mary Travers.