The teenage girl walked into Sungate Kids child advocacy center in Greenwood Village and refused to speak to anyone, including her own mother. Another family member had been accused of sexually abusing her — the kind of case employees had seen countless times before — and the girl was deploying the best nonverbal defense she had. “She was curled up in a ball in her chair, and she had her head down and her face covered by hair,” said Amber Urban, criminal investigator for the 18th Judicial District in Arapahoe County.