"My son and I break down and lose it and sometimes you feel like you're never going to regain your composure, so it's tough to stay strong," Billie said.
According to Billie Dunn, she was questioned for 10-12 hours on Wednesday night after admittedly failing a polygraph test. Dunn explained the details of the polygraph testing on Thursday night's "Nancy Grace" broadcast.
Dunn also said that her boyfriend, Shawn Adkins, also failed his polygraph test. Since then, Adkins has left Colorado City and is now staying with his grandmother in West Texas. Dunn said she asked Adkins not to come back.
Hailey's father, Clint Dunn, has not taken a polygraph yet, and is not scheduled to take one at this time. He says he has volunteered to take a test.
"It's not safe (here) and this makes everybody realize it," Clint said. "I'm just worried about my baby girl and I miss her."
Watch the embedded video for the full five-minute interview with Dunn's parents.