Hi, don't know if this is the same person you all are talking about, but this is what a search turned up for me:

songsearch.icorp.net/ss/dir/olo_hara_mary.htm

has several recordings listed.

And:

tns.cs.mit.edu/harp/archives/1994/subject.htm

this is apparently linked somehow to a good sounding site for harpists and has a query about Mary from 1994 from someone who wanted to include an article about her.

Don't know if it helps or not. Good luck, she sounds wonderful.

Has anybody seen "Sister Wendy" on BBC America? Maybe she could expand from the classic world of art and search out Mary? ***grin***