Hi oldbiker
Have you seen or attempted to obtain a copy of Susanna's marriage entry in the Parish Register? The details could assist us in identifying to which families both parties belonged. This was at the start of the 'golden' era for coaching in the West Country, which enabled mobility outside the usual '12 mile rule', so it would be useful to know to which parish each belonged and the marital status of each.
I see on the FamilySearch site that they had 4 children baptized at Axminster, the eldest named Robert 04 Apr 1802. If the Susana recorded aged 70 in 1841 was his mother, it might have been a second marriage for either party.