First, her hair looks smooth to me--not a snarl. This sounds like some wad of hair.
Feldman's only hypothetical was regarding a scenario where the fiber gets in Danielle's hair and then she doesn't move. Sounds like a concession to me.
Even granting your "not groomed" statement, she certainly moved since the cookie visit! She would also sleep and wasn't she in a dressing room at Mervyn's? The act of changing clothes---never mind that between the cookie visit and bedtime and school she would have changed clothes numerous times--would dislodge a fiber.
...and how many orange outfits did she try on at Mervyn's? How about a fiber or two getting entangled in her necklace as she was pulling tops on and off?
If you read the testimony as to the fiber and hair you would not say this. It wasn't LOOSE. It was BOUND up in the hair which was STUCK to the necklace.