Thanks for the information.
I would really appreciate the details of the biographies you mention if you ever come across them. I have a biography of Caroline & Stephanie by Susan Crimp & Patricia Burstein written in 1998 but as you say there's often much reworking of the same information in many of the books published. I would have thought Caroline might have trusted someone to tell her story like Grace did with Gwen Robyns (is this author still alive?) Alternatively wouldn't it be wonderful to have some kind of photographic tribute?