Follow the heron is good. Karine is here.
Did you see Reg Meuross at Auckland? The band played Sweet Marie. would be a lovely one that only a few people over here have heard.
Lots of people here sing Paul's Farewell to the gold so I don't recommend starting with that but maybe she would like Rose of Allendale
Or something by Kate Rusby or Mary Black or Maddy Prior and June Tabor .
If you or your friend check out the repertoire of these singers on youtube you might find quite a few songs that are suitable.
Cheers,
Robyn