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A gun-loving Florida mom was accidentally shot in the back by her 4-year-old son with a .45-caliber pistol he found on the floor of her pickup truck, police said Wednesday.

Jamie Gilt, 31, was driving to a relative's home on Tuesday afternoon to pick up a horse when the boy, who was sitting in the seat behind hers, pulled the trigger, the Putnam County Sheriff’s Department said in a news release.

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A deputy noticed Gilt's truck and horse trailer and "observed an adult female in the driver’s seat motioning to him as if she needed assistance," the release said. "The deputy ran to the vehicle and quickly determined that the driver had been shot."

Gilt was rushed to hospital in Gainesville, Florida, where she was in stable condition. Her boy, who was not harmed, was turned over to relatives, the release said.

The Florida Department of Children and Family Services is investigating how Gilt's son got his hands on her pistol.

"The firearm was legally owned by the victim and the child came to possess the firearm without the victim’s knowledge," the news release stated.

But under Florida law, "it a misdemeanor for a person to store or leave, on a premise under his or her control, a loaded firearm in such a manner that it is likely a child can gain access to the firearm."

Gilt lives in Jacksonville, Florida. A woman by the same name ran a Facebook page called "Jamie Gilt for Gun Sense," where she posts pro-gun pieces and articles critical of politicians who back gun control like President Obama and Democratic presidential candidate Bernie Sanders.

Among them is a posting that reads, "My right to protect my child with a gun trumps your fear of my gun." The page was live until Wednesday.