In April, the 57-year-old actor had responded to "urgent messages" from her son's friends who were concerned about his mental health, but when she visited him at home, he allegedly "brutally" attacked her in a "manic rage" and police were called.
However, Fulton urged police not to arrest 33-year-old Weston - whose father is Nicolas Cage - but to have him admitted for a mental health evaluation.
Speaking after her son was arrested on Wednesday, Fulton said in a statement: "On April 28th, 2024, around 5.30pm, I received urgent messages from friends of my son, Weston Cage, regarding his deteriorating mental state, urging me to come help.
"When I arrived to offer support and console him, he was already in the midst of a manic rage. Within minutes, I was brutally assaulted and sustained serious injuries.
"Despite my desperate pleas to the responding police officers to detain him for a mental-health evaluation, the police officers refused my request.
"As a mother, I am deeply saddened and concerned about Weston's ongoing mental-health crisis.
"It is imperative that he receives the help he desperately needs."
Cage was arrested on felony charges of assault with a deadly weapon after turning himself into police earlier this week and was later released on a $US150,000 bond ($A222,000).
Los Angeles police told People magazine: "During the incident, Cage punched two victims multiple times, causing injury. LAPD responded, and after meeting with all parties, a police report was completed."
The case was presented to the district attorney's office on May 10 and on June 26, they filed two counts of assault with a deadly weapon against Weston, issuing an arrest warrant some time after.
In 2011, Cage faced domestic violence charges after he had a dispute with his ex-wife Nikki Williams, according to ABC News.Â
He was hospitalised on a psychiatric hold in 2011 after a violent incident in LA.
Fulton and Nicolas Cage started dating in 1988 and had Weston in 1990, but the couple never married and split within a year of their son being born.
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