Hi
Sorry, spent a few hours on it and haven't come up with anything as yet, only maybe the same as yourself, that a Elizabeth Latham married Stephan Chesters at Davenham 1829, he seems to have died Middlewich 1846, and maybe Elizabeth also before the 1851.
There is no name index for the 1841 census in the areas you are interested in, and unreadable in certain districts.
It does look however that Elizabeth and Samuel Richardson's first daughter was registered as Flora Chesters not Richardson and was born in Wharton 1860, so who did Elizabeth know in Wharton well enough to have her child there ? it may be an advantage to obtain the birth certificate of Flora Chesters b1860 to see who registered the birth. as well as a copy of Elizabeth's b1839 Over/Winsford.
There does not seem to be a marriage for Samuel and Elizabeth, unless you have found one, if so again the certificate would be a great help. Also the fathers details on the marriage certificate of one of Mary's marriages may also tie in with Elizabeths birth details.
hope this is of help
peterbennett