Since this profile is not project-managed, I'd say you are free to create a second profile and parse out the information belonging to each of the two women. You could revert the profile to how it looked in 2012 but that might make it harder rather than easier at this point.
As a pre-1700 profile you should use reliable sources https://www.wikitree.com/wiki/Space:Pre-1700_Resource_Page; this one still clearly has gedcom-import junk in it and "familysearch.org" is clearly not a source. If you want an example that is a little simpler than some, here's one I created https://www.wikitree.com/wiki/Goulder-219 (not to brag or anything :)
That particular Witherspoon family book here does not provide specific sources for it's assertions from what I saw so by pre-1700 standards it would be considered a research guide to find primary records and could be cited as a "See Also" but not as a primary source and would not be adequate by itself. It makes the usual statements about extensive research, town and church records etc which is well and good but ideally you should find actual primary sources you can cite to support specific facts.
Best of luck and thanks for taking on the cleanup!