Susan Cassady (or Cassidy) was married to Alexander Morrow around 1763 in what is now Northern Ireland. The exact location is disputed. She came to American around 1793 with her seven children, one son-in-law, and one grandchild. A second grandchild later said he was born on the way over. Cemetery records indicate that that Susan was buried in this cemetery, but her monument is no longer identifiable. See her husband's memorial for more information.
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From "History of the Pan-Handle: Being Historical Collections of the Counties of Ohio, Brooke, Marshall and Hancock, West Virginia," compiled by J. H. Newton, G. G. Nichols, A. G. Sprankle (Heritage Books, 1879), p. 321:

St. John's Church (Episcopal)
From the examination of the monuments in the cemetery, we learn that the first interment was that of Elias Barney, who died September 11, 1805, in the 16th year of his age. The next monument is in memory of Alexander Morrow and Susan Morrow, 1808.
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From "Alexander Morrow, The Emigrant and Progenitor," by Evelyn Potter Park, c. 1981:

Children of Alexander and Susan Morrow
1. John Morrow b. ca 1766 m. Eleanor Welch Aug. 1803 d. Feb. 20 1854
__1. John Welch Morrow m. Nancy Hays
__2. Alexander Morrow m. Eleanor Lindsey
__3. Susan Morrow m. Thomas Endsley
__4. Mary "Polly" Morrow m. Jeremiah Aten
__5. Samuel Morrow
__6. Nancy Morrow m. Andrew Young
__7. William Morrow m. Mary Morrow, dau. of Alexander Morrow
__8. James Morrow m. Nancy Cunningham
2. William Morrow b. 1769 d. August 1839 Unmarried. Lived on his father's old home place.
3. Margaret Morrow b. 1771 d. in August 1848 Keene, Coshocton, Ohio m. Robert Morehead ca 1790 in Ireland. See "Morehead Family."
__1. William Morehead m. Elizabeth
__2. Alexander M. Morehead m. (1) Nancy Gibson (2) Eliza Patterson
__3. James Morehead m. Carolyn
__4. Andrew Morehead m. Margaret Hesser
__5. Margaret Morehead m. Thomas C. Elliott
__6. Samuel Morehead m. (1) Margaret Morehead m. (2) Harriet Zink
4. James Morrow m. (1) Ruth Davis (2) Nancy Elliott James b. 1773 d. before 1830
__1. Charles Morrow m. Sarah Jane
__2. Alexander Morrow m. Sarah J. Wilson
__3. James Morrow m. Eleanor Alliison
__4. Aaron Morrow m. Jane Clark
__5. Susan Morrow m. (1), Robert Glenn (2) John Anderson
__6. Isabella Morrow m. Joseph Harper
5. Alexander Morrow b. 1775 m. Susannah Welch 1820 d. 23 Aug. 1847
__1. Robert A. Morrow m. Margaret Warwick
__2. Margaret Morrow m. Benjamin Swearingen
__3. Susan(nah) Morrow m. Rufus Covert
__4. Nancy Ann Morrow m. Daniel Lockard
__5. Mary Morrow m. William Morrow, son of John Morrow
__6. James W. Morrow m. Emily Trago
__7. Alexander Morrow m. Elizabeth McCoy
6. Nancy Morrow m. Samuel Logue (d. in the War of 1812). Nancy was called Nancy "Mittoe" or "Mitten" in her father's will m. (2) a man named Tumberlick
7. Elizabeth Morrow m. David Pollock