To determine whether \( \overline{NO} \) is a constructed copy of \( \overline{PQ} \), Thuy needs to compare the lengths of the two line segments. 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.
This option involves measuring the length of \( \overline{OQ} \) and using that measurement to check if \( \overline{PN} \) is the same length. If they match, then \( \overline{NO} \) can be confirmed as a copy of \( \overline{PQ} \).