Per code they can sue in either the state opened or the state that you reside in (usually the county level). So yes, RI SOL could be a factor in their favor even with the Dec 2000 DOFD/DOLA.
AS to what to do - you need to receive the letter from the attorney before we can say 'what next' -- who is reporting on her credit a CA or an OC for the item you mentioned? What account is this attorney handling - is it the one on her credit - or something else?