I queried earlier about William Blainthwaite, who turns out to be a real person who left tracks in all sorts of ways in early Maryland. He travelled, undertook responsibilities for Lord Baltimore and traded with Indians. He married. But I can find no documentation that he had a daughter Margaret.
Margaret is said to have married Alexander Magruder, immigrant and progenitor of his numerous Magruder and other descendants. Numerous prominent secondary sources over the years have given her dates of birth, marriage and death, none without a trace of documentation in primary sources. As more and more real facts are found about her supposed father, husband and children, the harder it becomes to sustain a credible narrative for Margaret. And the most recent credible genealogists and historians don't believe she ever existed. So I'm documenting all this on Margaret's profile. At a point in time this will lead to severing her from the people who are not her parents, whom she never married, and from the children she did not bear.
None of this should happen, of course, if there are facts out there proving she was real. I've looked and looked for them and haven't found them, but there have been plenty of times when someone else has found stuff that I couldn't. So please, if you can prove Margaret was real, add some good documentation to her profile!