from Tom Russell's album The Man From God Knows Where:

Wayfarin' Stranger:
http://www.youtube.com/watch?v=9-b_G4ZkBqI&feature=related

The Old Rugged Cross:
http://www.youtube.com/watch?v=bVUFHM8ZZJA

She sang in 8 tracks on this album, including solo on Acres of Corn.
I can't find any of the others on YouTube, but it's worth buying the album just for her songs.