Jane Anne Franklin married 1st Capt. Richard Sherlock in 1835 , and then 2ndly she married  a George Cashel Esq in 1839 and they lived for some years in Roselands Cottage, Listowel,  Co Kerry.  I believe this George Cashel was the eldest son of George Cashel Esq of  Bedford House Co Kerry, and also of Shallee  in  Tipperary.  Tipperary being his main  home. 
I think Tipperary would be a good place to start  searching.   When I did a little research on this family  a little while back,  I found that there were  George Cashel, Cashell, Cashil , Cashills  galore,  and that Tipperary seemed to be  where  the 'seat' of the family was .  I understood that  in the early days, they  owned mining land or rights there .    Cashin   could also be an earlier derivation of  the name as well. 
Good luck with your  George's   Laura !