Hey Sue - hold those lines - it was a lucky "find"
Not sure if it provides any clues but it seems as though Miss Ravenor was a Sister at Chelsea Infirmary in October 1914 - when she was appointed Acting Matron of "A large new establishment for the reception of refugees has just been opened at Carrington House, Deptford"
Unfortunately I can't find a first name for her in a quick look - a 1907 entry gives an address for her of 10 Oxford Road, Worthing