This Will extract from the Notebook seems to be her, but she is called Mary instead of Margaret. The Burial is also Mary. As far as I can tell, only the 1756 IGI marriage says "Margaret" because the baptisms for Lonan don't provide the mother's name. So is she Mary or Margaret? I don't know. I don't see a Margaret death so it doesn't look like they are different people.

1797-2 E w KERMOD Mary SKILLICORN [bur Lon 17970816] d 15 Aug 1797;son Jon,wm;names Mary + Ann Skillicorn;dau-i-l Ann Kermod;husb wm

Husband William Kermode died two years later and the Will extract for him:
1799-2 E w KERMOD William [bur Lon 17991031]d 2 oct 1799;son wm(eldest) exec,john;maid serv ann skillicorn;bro john