Hi Sue,
It took me a while to work through that. It is possible as Elinor Claque/Corkill would be 43 in 1820, however, I think the big gap between 1813 and 1820 is a stumbling block. There are other Elinor Claques on the Island perhaps Peter Corkill set up house with another Elinor. One thing is certain Mary born 1804 cannot be my Mary Ann because she had a son born in 1862. Do you know when Elinor born 1777 died?