One thing not noted on the profiles of either John Sweet, Elizabeth Jeffreys or Elizabeth Unknown is that Torrey gives the surname of John Sweet's wife as "[Scott?]". The 2003 The New England ancestry of Alice Everett Johnson, also states this but is weakly sourced. Even if this possibility can be eliminated or is unproven, I suspect it needs to be discussed so that it doesn't reappear.
The argument for Elizabeth's surname being Jeffreys seems to rely solely on her age and forename. The entry for Robert Jeffreys in GM4 notes that the entire family are not mentioned in any New England documents after 1646, and probably left New England. His Wikitree profile notes some evidence that he was in London, citing Moore's Abandoning America, but she makes it sound less certain than her source, Aylmer's The state’s servants: the civil service of the English Republic, 1649–1660 (page 63), which may be quoting a source calling the man in London 'a new England gent.' I have access to digitised images of the relevant documents (UK National Archives SP28/258) but Aylmer doesn't specify which of the 654 folios in the piece is the relevant one, so it would be quite a bit of work to find it. If Robert Jeffreys returned to England with Edward Winslow in December 1646, as Moore hypothesises, then Elizabeth would have been 17 and unlikely to have stayed behind in New England.
