When she regained consciousness she was stretched in the ditch out, soaked to the skin.
1. out in the ditch stretched
2. on the ditch outstretched
3. outstretched in the ditch
4. No improvement
. (c) outstretched (Adj.) : spread out as far as possible
stretch out (Phr. V.) : to lie down in order to relax or sleep
Here, outstretched in the ditch is the right usage.