Ms. Shen also stated on cross examination that such a statement was nothing more than a guess.
My experience with hair and necklaces and little girls is that it could have been there for a very long time. The fiber was tangled into a ball with hair. That entanglemane does not happen suddenly. It takes quite a while for the random movements of the hair and the fiber and the necklace and the skin to truely tangle something. That is one of the reasons that I have totally dismissed most of the fiber evidence (besides the fact that no one has any idea where it could have came from except DVD's alma mater).
BTW, it sounds like much more than the normal amount of hair one would encounter beween necklace and hair.
I wonder if they showed the jury the clump of hair? Do you have that testimony handy?