Susannah Mason born 1765 - Soudley (General)
Hello Elaine,
If I was researching her, first port of call would be the IGI at your local library, or do a search of the IGI on the Net. You'll get an idea of Mason's in Gloucestershire and in which parishes. With a bit of luck she may be on the IGI. I noticed earlier this afternoon that the name Mason features in nearby Monmouthshire also.
Just had a quick look. There was a Susanna Mason christened 3Mch1765 at Newent, Glos.
Roger