PJ Media reported Lori Brown said the suspect who allegedly attacked her son "should have not been allowed to have an illegal knife on him and use it to murder somebody."
She is lobbying Texas Republican Gov. Greg Abbott for more restrictions on knives.
"As with gun control, she seems focused more on restricting access to the weapon the murderer used than on enabling victims to defend themselves," the report said.
Her son, University of Texas at Austin student Harrison Brown, died in a stabbing attack on campus in May 2017.
"I have nothing to lose. I will not take 'no' for an answer," Brown declared. "If something like [the stabbing attack] happens again, I just don't know what I would do."
Authorities have charged Kendrex White, 21, with murder and aggravated assault in the stabbing spree that killed Brown's son.
Police report he used a "Bowie-style" hunting knife to attack and injure four students.