Some posts above Irene said,
I'm pretty sure she was one of the singers featured in Shirley Collins' illustrated talk "America across the Water"

You are right on that one - the Lomax/Collins recording of her singing Rainbow Midst Life's Willows is in the show though the name of the show is America Over The Water.

Rainbow Midst Life's Willows is a version of the song that Pop Maynard called Locks & Bolts.