Earlier Wednesday, investigators examined clothing in a red pickup truck parked next door to the Cass family home. They also set up police tape around the Cass family home and began examining the home in detail. Celina lives with her mother, stepfather and 13-year-old sister. Celina's stepfather and mother have not released any statements since she vanished.
ABC News consultant Brad Garrett, a former FBI profiler and agent, said that it's not disconcerting that the parents haven't yet spoken. He said that it's key that investigators talk to Celina's friends and glean as much as they can from her computer and phone records.
"I would focus more on what has changed in Celina's life in the last 24 or 48 hours," Garrett said. "The key with kids this age...is to interview those other 11, 12-year-olds that she associates with online or in person."
Celina kept an open Facebook account which could have attracted a sexual predator, Garrett said.
"Predators are out there looking for people like her that they connect with. If she does not have a closed Facebook page, that's a direct entry for someone," Garrett said.
In the last 48 hours, Celina's family and community members have posted flyers emblazoned with Celina's image.
"We're putting them everywhere," Lori McKearney, the girl's aunt, told ABC affiliate WMUR. "We have people going to Lancaster, Jefferson, Whitefield, Littleton. We're going to Pittsburg."
The startled community gathered Wednesday night for a solemn vigil.
"It's a small town and we don't expect anything. Everybody knows everybody, everybody loves everybody. Everybody takes care of everybody. This is not suppose to happen, not here," said Lizette Hewitt at the vigil.
Celina's school houses just 85 students and many of her classmates are afraid.
One girl described her fear as "very, very strong. I miss her a lot, everybody misses her. Everybody's scared. There's nothing much we can do except pray for her. And I wish everybody would do that for her."
Celina is 5-foot-5 and weighs 95 pounds, with long brown hair and hazel eyes and was last seen wearing a pink shirt, a pink pullover, blue shorts and shoes.
If you have any information about Celina's whereabouts, call New Hamphsire State Police at 603-846-3333.
ABC Affiliate WMUR contributed to this report.