It is very hard to tell for sure without seeing what was going on in court,
BUT, my interpretation is that there WAS a HUGE WAD of hair, very dirty/grimy and there were some hairs stuck to the choker with the orange fiber tied to them. I think that your interpretation that a HUGE WAD HAIR had been stuck to her choker isn't right. After her body started decomposing and parts of her scalp were pulled loose by animals, that a wad was there. Maybe stuck to the choker.
None of this (your or my interpretation) clears up how long the hair or fiber could have been stuck to the choker.
SO, my thoughts went this way.......
Little girls tie their hair up with those elastic-cloth covered things. I don't know what they are called.
Could Danielle have had one of those ? Orange fibers ?