Did I understand you correctly? Her leg was "sawed off"? How & from whom did you learn that her leg was "sawed off"?
Not while she was living, of course, but they have found even the tiniest bones from the whole rest of the body, but the whole left pelvis and the whole left leg on down to the toes is missing.
If it WASN't sawed off, how did it get separated? If the body had already decayed when this was done, so it wouldn't have had to be sawed, why, then the little bones would have been too hard to find and separate, so it must have been done while the thing would still hang together.
Hence voila, I see a saw.