My posting is to show that the fiber came to be in her hair on the necklace at the time she was killed.
Several posters have said she could have picked up the orange fiber during the cookie selling visit a few days prior.
Jennifer Shen, the witness, stated on direct exam (I posted it much earlier on this thread) that the fiber came to be there at time of death/placement at Dehesa.
The excerpt you are referring to is Feldman's cross-exam where she affirms this and he seems to accept it and works in his later date theory by getting her to agree that *if Danielle wasn't moving around* the fiber could come to be there earlier.
Does that make it clear?