The "Miss Whately, in Fp. in Germany" might have been Octavia Whateley [sic], b. 4 Dec 1801 Birmingham, d. 14 Mar 1883 Stuttgart. She resided in Stuttgart from about 1869 and was considered the centre of a network of connections between England, France, Germany, Switzerland and the Netherlands. It was probably her that Carl Brockhaus was referring to when he wrote about an English sister in Stuttgart who was "so spiritual that you could easily make two brothers out of her".
However, Darby also met a Miss Whately [sic] in Frankfurt in 1853. About her nothing else seems to be known.
Many thanks to Michael Schneider for his brief note concerning Octavia Whateley. I had always thought "Miss Whatel[e]y" was Elizabeth Jane Whately (1822-93) the eldest daughter of Richard Whately, the archbishop of Dublin many of whose works she edited.. E.J.W was the author of Plymouth Brethrenism (London: Hatchards, 1877) and as she had lived with her father in Ireland for some years, she was well-informed about the Brethren, as indeed was her father. I have included in my Elusive Quest (p.164 n.92) a quotation from Richard Whately's pamphlet (1846) opposing the foundation of the Evangelical Alliance which he likened to the Brethren. E.J.W's name is wrongly spelt as 'Whatley' in Pontis's 'Brethrenistic Bibliography'. Timothy Stunt