Sylvia, I'm poring through a list of Braddan burials I copied out years ago of Gellings and Kewleys. There's an Isabella Gelling age 66 Jan 27 1841, and an Isabella Gelling age 76 Dec 31, 1836. The former is probably too young but the latter could be good for a 1788 marriage. No aliases were listed after about 1834, nor is there any other bits of information.

Brian Lawson's will index has wills for both of them. There's also one for 1820 but checking the burial record, that will be for Isabella Gelling als Oates age 24 years buried Mar 25 1820.

That's about all I can see. I didn't spot a Cavendish alias unfortunately.

Eric