"She used the n-word, so in my defence for the employee, I walked by and asked her if she was miserable with her life."
During the fight, Amber is heard encouraging her son to punch the other woman in the face.
"My son takes martial arts classes," Amber told the Smiley Morning Show.
She said she doesn't blame Walmart employees for not intervening, but is critical of security staff and onlookers.
"No one jumped in, no one tried to help, no one tried to pull my son back."
She added that she was concerned for her son.
The man filming the fight is heard remarking "This is white trash at its finest".
After the fight, Amber said the man who filmed the Youtube video was showing his footage to police, who laughed.
"The guy with the camera was showing the video to the cops and they were all standing around laughing about it," she said.