Can't see a marriage, but this could be Augustas baptism :
United Presbyterian Church, Spittal, 1814.
Augusta Kidd, daughter of John Kidd, by Augusta his wife, of Unthank Square, parish of Tweedmouth and County of Durham, baptised 20 May, born 22 March.
There is an Augusta Kidd, age 20, living in Lowick in 1841 census, a couple of pages away from Robert Gibson.
Alan.