At 8 years old, most dogs have proven to be trustworthy or have mellowed out, those that did not would not have lived to 8! So mostly I would concentrate on asking about her patrolling habits. Does she stay with the flock, does she patrol very far, if so how far? Then the usual stuff about how she gets along with people, children, pets, any quirks?
8 is indeed retirement age for a LGD, but retired dogs need a job too, we just don't let them know we got the young pup to help them out.
Tamarack Prolific and Ile de France crosses