Hi Julie,
I don't know if your friend will find this helpful, but there is a National Poetry Therapy Association and I believe they promote reading and writing poetry as expressive therapy (for many frail populations.) I think that these people may be able to help:
http://www.poetrytherapy.org/
Sometimes, talking to each individual and finding out what makes them tick, their personal story is a way to see which or if poetry might speak to them. Maybe having some varied anthologies on hand would suit most needs.
Good luck, Eileen