I, too, am interested in Rev. William Beckett's second wife as I think she's an ancestor of mine.
When Beckett married her she was the widow of Rev. Christoper Wilkinson (died in 1729) of Queen Anne's County Maryland. (Wilkinson's will identifies his widow as Sibella and says he has a daughter named Anne Coward, also named Ann Seward in another source, who at the time was childless.) Sibella's maiden name was Davis and she was born in 1690. Her parents were John Davis (1654-1712) and Ann Lewis of Talbot County, Maryland. I'm positive about this part and have found several sources that support it.
What I'm not sure of (at all) is my family's connection to her. I keeprunning across tidbits that make me think she was married before she marriedRev. Wilkinson probably around 1725. It seems odd for that time period that she wouldn't have married untill she was 35. Here's where my family line comes in. I think she might have had a first marriageto Richard Coward of Talbot County, Maryland. He died in 1722 leaving 3 young children, one of whom was named Ann, and a wife named Sibella.
In 1718 Richard Coward wasthe guardian of a minor boy named David Davis. David had a sister named Sibella.
Richard's daughter, Ann, did not marry untill 1730 (to Joseph Prout) so she might be the same Ann Coward that Wilkinson mentioned in his will.
Also, Richard Coward and a William Beckett worked together in 1719 in appraising several properties that had belonged to a Thomas Lewis (Sibella Davis' grandfather's name).
The connections seem to make sense but I'm not positive. I'd appreciate any input you have.