Zella, the WikiTree DNA connections are not made by comparison of DNA data of two (or more) people. Here, you only report that you have taken a DNA test and then that information automatically appears on profiles that have been connected to you as your parents, their parents, etc. The fact that you entered your test information on your profile, combined with the fact that it is shown on your mother's, grandmother's, and great-grandmother's profiles is the result of that and not of any matching of anyone's DNA data with anyone else's.
I don't understand the information you put here for Lizzie Fisher Vickers. Does she have a WikiTree profile? If so, what is her profile's ID? (It would probably be Fisher-xx where xx is a number, but might be Vickers-xx). I also don't know what census report you are referring to. Could you please put the census information and/or citation here so that we can all check it and be able to help?