The Margaret who married Simon Miller is unknown. She was not the daughter of Daniel Gaines -- that Margaret would have been too young to marry.[1] [2]
This Margaret is the same as Martha Margaret (Baxter) Prosser (abt.1625-abt.1670). Don't see where there is any more support for her being a Baxter than there is for her being a Gaines at this point.
The following notes are taken from the Arnold Family Assoc. of the South newsletters on famiies that appear to be closely allied with Thomas and Grace Arnold.
"Miller, Simon Imported by Andrew Monrowe who received 920 acres in Westmoreland Co. 26 Oct. 1666. Miller received 817 acres in Rappahannock Co. on the South side of the River, on head of Pewmanesee (Peurmansend) Creek adj. among others, Prosser and Cadwaller Jones. He later sold 625 acres of this land to Cadw. Jones. His will proved 5 July 1683 by Francis Thornton and James Taylor. Simon Miller’s wife was Mrs. Margaret Prosser, widow of John Prosser. She had earlier been married to William Goffe. Wm. Goffe and Margaret, his second wife, were the parents of Thomas Goffe, who was the father of MARGARET GOFFE, wife of THOMAS [sic Isaac] ARNOLD."
"Prosser, John Was married twice – first to Martha (?) and secondly to Margaret (?). His land was on Pewmansend Creek, today wholly within Caroline Co. He named a son, Samuel and his eldest son, John, had sons Roger and Anthony Prosser. Appointed Mr. James Kay to assist his wife as Executrix of his estate. Will signed 28 Aug. 1673, probated 30 June 1677. The Prosser in the 1689 deed (ARNOLD to Going) was one of his sons."
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[Do you know Margaret's family name?] | M > Miller > Margaret (Unknown) Miller
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This would make this profile a possible merge or rejected match with profiles https://www.wikitree.com/wiki/Gaines-211 and https://www.wikitree.com/wiki/Gaines-219
More research needed of course.