Melton remains in the hospital in critical condition. Police said an argument between the two ensued, with both parties yelling at each other.
But Quackenbush got out of her vehicle, armed with a gun, followed him, and the row started again, at which point she fired two shots at Mr Melton, wounding him in his stomach. He is being treated at the Vanderbilt University Medical Center for abdominal wound.
Quackenbush, an aspiring singer and mother of a 5-year-old boy, was arrested and held on a $25,000 bond.
However, her father, Jesse Quackenbush, said that his daughter was only firing warning shots and that she did not mean to kill him. "She didn't know that she hit him".
Police said Quackenbush never reported the incident. According to the lawyer, Melton accosted the victim and threatened to kill her and her friend, after making sexually explicit comments while they sat inside the Porsche.
After the incident, Katie and her friend continued to dinner and did not report the altercation for two weeks despite seeing the crime tape surrounding her friend's vehicle when returning from their dinner and the scene they had left behind.
Jesse adds that the homeless man walked towards the women and that's when Quackenbush fired two "warning" shots.
Dartmouth hospital locked down after report of shooting
Dartmouth-Hitchcock Medical Center is New Hampshire's largest hospital, and is located in the west-central portion of the state. Dartmouth College, an Ivy League school, announced that classes have not been cancelled and the campus is operating normally.
His daughter told him, "I have a gun stay away from me", Jesse Quackenbush said. She was only defending herself.
Quackenbush, who goes by the name Katie Layne as a singer, has no prior criminal convictions.
Citing the female passenger and his daughter's version of the incident, Jesse Quackenbush said that Melton was "rambling" about religious things and made "incomprehensible" and "incredibly violent threats" to both women.
After the second shot, "he still kept coming forward, she jumped in the driver side and sped away because she was afraid for her life", Quackenbush told NewsChannel5.
When they returned, Quackenbush's friend's vehicle was surrounded by crime scene tape.
"She has a son", the attorney said. The police department didn't hear anything from Quackenbush until her attorney reached out to the prosecutor's office at the start of the following week.
Quackenbush is scheduled for a court appearance on October 6.