The only thing I heard say about her, is that she was into some really old stuff. That means Sweelinck, Byrd and music like that. But I never heard any of her recordings; to be honoust, I wasn't even sure that it was a "she"!
Yes, she was French indeed! She is famous for 'resurrecting' a lot of the harpsichord repertoire (mainly Couperin, Scarlatti and Rameau-she recorded the complete Rameau)suites and those recordings are sublime! She used to mix a lot of Baroque music and then 20th-century French composers in her programme. She recorded all Ravel's, Debussy's, Chabrier's works. But most of those have long been out of print. They used to be available under 'Les Introuvables de Marcelle Meyer'. There are 3 sets of about 4/5 discs each. If you ever stumble upon any of them, don't hesitate to buy them. Truly marvellous stuff!