Probably Sarah Ann Allen.

(see S20n2 )

Her brother would be James Thomas Allen (mentioned under S11n2 )

or Ebenezer King Allen, aged 19--b. 9 July 1796.

(James Thomas later settled at Hubbards Cove. Ebenezer King was m. 9 oct. 1828 at Boston to Agnes, dau. of R. Richardson, of Boston. D. 27 Feb. 1876 at Boston.)