Individual Details

Emma emigrated to America with Samuel and Africa after John's death. They were in Perquimans Co NC perhaps as early as 1694.
"on the first Monday in February, 1693/94, Edward Mayo proved thirteen headrights for the taking up of land (50 acres per person):
Edward Mayo, Sr., Edward Mayo, Jr., Sarah Mayo, Ann Mayo, Elizabeth Mayo, John Nixon, Em Nixon, Samuel Pike, Affrica Pike and three slaves"

She is "given" the surname Blount in many instances in online trees. There is no basis for such a surname and should not be considered her surname without primary documentation that has not yet come to light.

Carolina Colonial Records. Feb. 1693/4. Edward Mayo proved his Rights [headrights] being Edward Mayo Senior, Edward Mayo Junior, Sarah Mayo, Ann Mayo, Elizabeth Mayo, Three Negroes. John Nixon, Em Nixon, Ann Nixon. Affrica Pike and Samuel Pike, in all thirteen.
[I think it likely that "Em" Nixon is the remarried widow of John Pike, father of Samuel and Africa - their mother was named Emma. Ann Nixon probably a daughter of John Nixon by an earlier wife.]

There is a marriage, Temple Church of England, London, for Emm Pike to John Nickson, 1 Jan 1683.
"England Marriages, 1538–1973 ," database, FamilySearch

Perquimans Deeds. Pages posted online - obviously from a book.
No. 35 Thomas Long & wife Ales to Edward Mayo, for 65# sterling, all rights which we have in the within mentioned Patent or Conveyance from the Lords Proprietors. 18 Feb 1687.
Wit: Em Nixon, Sarah Mayo. entered 26 May 1688.
No. 37 Richard Evans & wife Elizabeth to Edward Mayo, (see #26) all our Rigts in the within mentioned patent from the Lords Proprietors. 27 Mar 1684. (recording not noted but must have been in 1688)
No. 39 Jean Nogwell, widow & relict of Lawrence Nogwell, lated Dec'd to Edward Mayo, all my right, etc to the within mentioned Patent, being a sale conveyed to Mayo by my husband. Signed Jean (her mark) Nogin.

A lawsuit in Chancery Court of Pasqutank, Oct/Nov Session 1706, which was against Samuel Pike concerning land he had inherited from his father in law [term for stepfather in this time period] John Nixon, effectively proves that Emma Pike had remarried to Mr. Nixon.

Hugh McGregor & wife Africa were involved in settling the estate of Em Mayo, wife of Edward Mayo, dec'd. July 15 1707. There was a dispute over a Negro slave. Source: North Carolina Higher-Court Records, Vol 1, p.160. This seems to be a third marriage for Emma Pike since she was Africa Pike's mother and there is a note that sd MGregor was pleading in right of his wife. Many have attempted to give Emma the surname McGregory or McGregor, but that cannot be proved and seems highly unlikely- and seems not to have been the case. Emma was never a McGregory/McGregor.

Marriage	Abt 1667	JOHN Pike
Marriage	1 Jan 1683	London, England - John Nixon
Death	Bef 1707	North Carolina

Spouse	JOHN Pike (1640 - 1681)
Child	Catherine Pike (1668 - 1679)
Child	Emma Pike ( - 1672)
Child	Robert Pike ( - 1673)
Child	Africa Pike (1673 - 1712)
Child	John Pike (1674 - 1676)
Child	Edward Pike (1676 - 1676)
Child	Elizabeth Pike (1677 - 1677)
Child	SAMUEL Pike (1678 - 1718)
Child	Mary Pike ( - )

Spouse

John Nixon ( - )