The woman, who asked not be identified given the violent nature of what she witnessed, said she owes God all the glory. She spoke with ABC13 Tuesday morning.
Doctors expect her to make a full recovery.
"I never prayed like I did last night," she said. "I'm so thankful for my life, but the main thing that I'm thankful for is that I didn't hurt anybody. Had I hurt those people that live in that house ... they could have just buried me right then and there because I never would have gotten over the fact that I had taken another human being's life."
The woman said when she was walking out of a gas station, she witnessed the violent shooting.
In her attempts to flee the dangerous situation, she said she passed out before coming to inside her car, which had crashed into a home.
"I heard, 'Pow! Pow! Pow! Pow!'" she recalled. "I said, 'Jesus, are those gunshots?' His arm was out stretched. I saw the gun in his hand. I said, 'Jesus, he's shooting a gun.' He was looking directly at me. He's fixing to kill me, because he's going to think I can identify him."
According to the Houston Police Department, 52-year-old Mark Jefferson was parked inside his vehicle at the service station at 7997 W. Airport Blvd. Investigators said a man parked his vehicle next to Jefferson's car. A discussion ended with shots being fired and the suspect fled the scene in a black Chrysler 300.
READ MORE: 1 injured in shootout on W. Airport; innocent driver ends up crashing into home
Jefferson is recovering in the hospital with wounds to his abdomen and arm.
The great-grandmother said she wants the gunman to turn himself into police.
"I would say to him if he believes that there is a God, he needs to turn himself in," she said. "He needs to turn himself into the police. I say by the grace of God, I could have been coming out of the store at the time the other guy was returning fire and could have killed me. I had nothing to do with it."
Anyone with information on this case is urged to contact the HPD Major Assaults and Family Violence Division at 713-308-8800 or Crime Stoppers at 713-222-TIPS.
Follow Steve Campion on Facebook, Twitter and Instagram.