But when everything from part-pelvis, right on down to big toe, is missing on the left lower hip & extremity, large and small, all gone,.... and everything else, right, left, and center, right down to tiniest hyoid and finger bones...is present...
that is where I break down and use occam's razor to say that it was not the random action of animals, water erosion, etc.-- but human choice to take [away from here] that whole leg and all that pertains to it [or not bring it here in first place], probably done while it was still entire (fresher).
Surely, SW, my idea may be mistaken, but it is not IMPOSSIBLE, is it? You WILL admit it is possible?
If you apply Occam's razor, the simplest solution is the likely solution; and that doesn't include the nefarious leg snatcher plan.
She was on an incline. One leg would be outer and would be more exposed to elements and the other shielded by outer leg and ground. Maybe the animals were interested in the outer leg while it had some flesh on it and by the time the inner leg is exposed it had little or no flesh.