Barbry Ellen Tab Experiment
Dulcimer Resources:TABS/Books/websites/DVDs
Basically everyone writes tab in their own way. So, if guitar-like notation works for you, that's great. Realize of course that Jean did not play chords in the guitar sense. She played Noter & Drone style, where the middle and bass strings drone open notes and the melody note is fingered only on the melody string... Mostly, noter & drone tablature is just written as a single string of numbers representing the melody string, one note for each note sung.
I did find this for you, from the Ultimate Guitar site -- the chords for Jean's unique version of Barbry Allen:
BARBRY ELLEN CHORDS by Jean Ritchie @ Ultimate-Guitar.Com