The boy, Kameron Prescott, was inside the trailer, although Salazar said deputies didn't know anyone was at the home in the San Antonio suburb of Schertz.
The boy, whose name wasn't released, was struck in the abdomen and died at a hospital.
"I can definitively tell you that myself and all the deputies involved, there's not a single one us of that wouldn't trade places with this child", Bexar County Sheriff Javier Salazar told reporters late Thursday. She was suspected of stealing a vehicle earlier this morning.
A dark-colored pipe with Jones' blood on it was found near her body, Salazar said.
Jones, on several occasions, "physically threatened him with that weapon and verbalized to him that she meant to shoot him with that weapon", the sheriff said.
Authorities are using a helicopter and a dive team to search for the firearm that they believe the suspect might have lost when she was running through the wooded area.
She constrained her way into Kameron's home, undermined to shoot individuals from his family and said she was taking their vehicle, the sheriff stated, including that Jones had no obvious connections to the kid or his relatives.
The deputies who opened fire - identified as John Aguillon, George Herrera, Jesse Arias and Johnny Longoria, a reservist - have been placed on administrative leave, the sheriff's office said. No weapon was found on her at the time of her death. Her death concluded a almost 2-hour chase, that began when a man called the sheriff's office to report a stolen auto around 11 a.m., and directed deputies to where he thought the woman had taken it.
When deputies found her again, it was on the front porch of the mobile home where the suspect had forced her way inside, Salazar said. They fatally shot her.
Kameron was home because his school let out students at noon for the Christmas break, according to the San Antonio Express-News.
"Preliminarily, I can tell you it appears as if policies were complied with", Salazar said of the shooting.
The felon, a 30-year-old woman who has yet to be identified, was trying to break into the boy's family trailer at Pecan Grove Manufactured Home Community when she was apprehended by four deputies.
"She ran towards me, asking for help, waving her arms at me", Mills told the Express-News.
"Everything I can consider at this moment is the thing that would I be able to have done any other way", she stated, "had it not been a half day". "I just turned around and walked off".