Camerawoman Petra Laszlo said in a letter to the Magyar Nemzet newspaper (in Hungarian) that "something snapped" in her as migrants broke through a police cordon, reported BBC.
She said that she reacted out of panic and felt she had to "defend herself".
A criminal investigation have been opened into the incident.
Ms Laszlo said: "I do not deserve the political witch-hunts against me, nor the smears or the death threats.
"I'm just a woman, and now an unemployed mother of small children, who made a bad decision in a situation of panic. I am truly sorry," she said.
A global outrage sparked after a footage of Laszlo kicking people and tripping them up, including a man carrying a small child emerged last week.