This page indicates that Mary Davis and Mary Bowater are the same person: http://www.ancestrees.com/pedigree/1394.htm
I am just as confused as you as to whether it is Bowater or Davis. I am finding in the attached marriage records that a Mary Bowater married a Steven Ailes and Mary Davis married James Wright.
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Josiah Ballinger Male 1690 NJ 1727 Mary Wright 1707 PA
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Mary Davis Female 1689 MO 1707 James Wright Aug
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Mary Wright Female James Jarrell
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Mary Wright Female James Treat
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Mary Wright Female William C Folkes
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Mary Dell Wright Female A C Wootan
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Elizabeth J Wright Female SC James Calvin Wright NC
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Nancy J Wright Female James H Castile
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Mary Wright Female 1691 1712 Benjamin Woodard 1690
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Mary Bowater Female 1685 PA 1713 Stephen Ailes
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Mary Wright Female 1683 MA 1703 Jeremiah Gifford
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Mary Wright Female 1683 MA 1703 Jeremiah Gifford
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Mary Wright Female 1683 MA 1703 Jeremiah Gifford
both in different stories