Wheeler and some other survivors and their parents have created a group called The Rebels Project to reach out and help survivors of mass shootings and families of victims.

"We have parents who had to carry us through dark ages and try to get us to be normal citizens," she says. "These parents know how to speak to parents. They are working to do something for Connecticut."

The project was started this past summer, after a gunman opened fire at a movie theater in Aurora, Colorado, killing 12 people.

Some people in the Aurora community who were traumatized by that mass killing have already been calling a hotline in the city, says Mara Kailin, program director at the Aurora Mental Health Center.

"We've been hearing from from first responders and folks in the community that were directly impacted," she says. "They're wanting to help people in Connecticut -- and being reminded of what we went through a very short time ago."