Livre d'Or

Do you mean Rabbi Leila Gal Berner's "Miriam Ha-Neviah"? It doesn't exactly say she'll return; it says she'll "bring us to the waters of redemption", which can be interpreted any number of ways.

There's an article on the emergence of Miriam as a major 20th/21st-century figure here that theorizes it has to do with the emergence of women as spiritual leaders who see Miriam as, essentially, a role model. Again, I don't know that resurrection is specifically part of that, but I think ideas and mythology around Miriam are generally changing quite rapidly, especially when she's set alongside Elijah.