The cross-country flight was being conducted by a flight instructor and pilot in conjunction with an instrument rating course from a Part 141 flight school. According to the flight instructor, upon reaching the decision altitude, they transitioned to a visual descent to the runway. During the descent, the airplane impacted trees and the flight instructor assumed control of the airplane and continued to the runway for landing. The airplane sustained substantial damage to the fuselage, right wing, and both horizontal stabilizers. The pilot stated that after terminating use of the view limiting device and she transitioned to visual references, she continued to glance back at the glideslope indicator, which showed that they were low on the approach. Shortly thereafter, a tree appeared in front of them, about the same time as they felt the impact. She stated that the precision approach path indicator (PAPI) would not turn on and there was not a current Notice to Air Mission (NOTAM) for the outage. The pilot reported no mechanical malfunctions or anomalies that would have precluded normal operation.