It's a good thing Carla and Dee were mature enough to take a deep breath, get their panic under control and realize they had to:
1 Tell the other counselors, but not panic the other girls
2 Make sure everyone was safe and accounted for
3 Send one person to go get help
At that time, DE didn't know exactly what happened, just that Carla had told her there was a body on the trail. They didn't know if other girls had been attacked in their tents, too. At the time, they didn't realize there were three bodies there, not just one. Michelle Guse and Lori Farmer were zipped up inside their bags, which were just piled alongside the path. So doing a fast head count let them know if other girls were in trouble or missing. Each counselor went to opposite ends of the tents to work towards the middle.
When the empty tent was found, Carla ran to get help, met the nurse on the path to the showers, told her so she could go to check the bodies while Carla continued on to get the camp director. Camp director got the ranger and they all drove down there. At some point DE walked to see the bodies, then ran to another unit to alert the other counselors.
Can you imagine the trauma, chaos, etc. if they had allowed those little girls to go down the path to see poor,dead DM laying there, partially nude, bound, legs spread apart? One of the counselors, DE or SE became physically ill when she saw them, had to go away to vomit and take some deep breaths to recover.
Overall, the counselors managed it as well as could be expected. What more did you want them to do?
ETA: Many years ago, someone posted a photo on one of the Girl Scout Murder web sites of DM's body, uncovered as probably looked when Carla found her. It was a horrible shocking photo and it was obvious she was very likely deceased.
Also, why would it be more important to make sure others saw the bodies instead of checking to make sure the other campers were safe?