To determine if \( \overline{NO} \) is a constructed copy of \( \overline{PQ} \), Thuy must compare the lengths of the segments. The correct approach is to measure the distance from point \( O \) to point \( Q \) using a compass and then place the compass on point \( P \) to see if point \( N \) is the same distance.
So the correct response is:
She must measure the distance from point O to point Q using a compass and place the compass on point P to see if point N is the same distance.