I'm not sure why but I clearly see a man wearing black bending over her in that video. That is the same video that is still up on Youtube from Channel5 and they (reportedly) removed the part of the video where she can be seen in the open, they edited it out, so that is not actually a tarp covering her body, that is a person bending over her body and looking at what they found, or at least that is what I see.
The feet in the video belong to the man bending over her. You can see his arm on the left side of his body. So I don't believe that is a tarp at all. At least that is what I see. There is another even more clear video of the same scene on YT and it contains the same edits.
Now that people have talked about the their tent being orange, that might be part of the orange in the video. Or maybe they had an orange sleeping pad?
Just my own observations.