You are on a hike with several friends and family members. About 5 miles along the trail you stop for lunch beside a river, where a friend's daughter is climbing on rocks at the water's edge. Her foot slips on a mossy patch, and she falls and strikes her head on a rock. Immediately an adult in the party helps her away from the water. Her head did not go under water, but she has a welt on her forehead and see seems groggy and mildly confused. A few minutes later she seems better, although she has a slight headache. You allow her to rest, but now you face the decision whether it is safe for her to hike back out. Unfortunately you have no means to call for help, and the terrain is too steep and rough to consider carrying her out. What should you do?