ok here is the set up. about 100 or so tunrs ago message came by of new padiens destruction (doen in my ai or monster i honestly do not know)..  however her kingdom borders remained and when i tried to cross them I got the your not welcome dialog. I purposefully did not go to war with her as I wanted to eliminate all others to see if her kingdom did actually exist.

here is save game file several turns before killing the other actual remaining kingdom.. I had just killed last Sovereign and then got conquest victory..  so she was gone but her borders and dialog remained.