PALATKA, Fla. (CBS NEWS) -- A north Florida woman told deputies her 4-year-old son shot her in the back while he was sitting in the back seat of her pickup truck.

A Putnam County Sheriff's Office news release says a deputy saw 31-year-old Jamie Gilt of Jacksonville behaving frantically inside the truck Tuesday afternoon and quickly realized she'd been shot.

The release says the woman told deputies her son accidentally shot her. He wasn't harmed and was reunited with family members. The Department of Children and Families will investigate.

CBS affiliate WTEV reports that deputies found Gilt with a bullet wound inside her truck with a horse trailer on the back stopped in travel lanes on a highway. She was on her way to pick up a horse, according to deputies.

Deputies say a .45-caliber handgun was on the truck's floor.

Gilt was taken to a Gainesville hospital, where she was in stable condition later Tuesday.

Authorities are investigating.

A Facebook page adorned with the image of the Putnam County mother holding a gun drew worldwide attention Wednesday, WTEV reports.