No, there really is a Lilah Gaither. However, I don't know for sure that she married Vachel Ijames.
Gaither family material states that there is an undated marriage bond for Vachel Ijames and Lelah (or Lilah) Gaither, which is specified as being during Gov. Martin's administration. This must be Alexander Martin, who served as governor of NC in 1782-1785 and again in 1789-1792.
Since the bond is undated, it's possible this marriage never took place. Alternatively, it could have been a brief first marriage, Lilah having died before he married Martha Cunningham in 1792.
Lilah was the sister of Basil and Benjamin Gaither, who married Vachel Ijames' half-sisters Margaret and Elizabeth Watkins (daughters of Ariana Worthington and Nicholas Watkins). Benjamin Gaither was bondsman for this undated marriage bond, Basil Gaither was witness.
But thank you for the information that Delilah Ijames was Vachel's daughter. I had her in my database, but not connected to parents.