There's a Judy Mayhan website, but it hasn't been updated since 2007. A paragraph there answers some of the questions that have been raised in this thread:

"Judy Mayhan began her recording career in 1962 when Horizon Records released her first LP, Rockin' The Cradle. The album presented Judy's remarkably clear and precise soprano voice singing traditional American folk songs and accompanying herself on mountain dulcimer. The album was later reissued by Everest/Tradition Records as Folk Songs of Olde Eire (even though most of the songs are not Irish). The whole album was recorded on the first take, with no playbacks. After over two decades during which the album became a rare collector's item, it was finally reissued on CD in 2002 by Shayomi Productions, which is owned by members of Judy's family."

Shayomi released four of her albums on CD, but

"Note: At this time we are not taking any new orders for CDs, either on this website or by mail. Hopefully we will resume order taking at some point in the future. Please check this site for updates."

There's a place on the site to click to send email. I don't know whether it works.