Ortiz – a speech pathologist – is scheduled to return for a preliminary hearing on 8 April and remains in detention, with bail set at $1.875m (£1.4m).
Her defence attorney – a public defender assigned to the felony case – sought to reduce her bail, but Los Angeles County District Attorney prosecutor Alexander Bott noted that Ortiz is accused of firing about 20 rounds from an AR-style weapon that put lives at risk, the DA’s office tells the BBC.
Bott argued in court that Ortiz allegedly had a wig with her to serve as a disguise, which he claims shows that she planned out the alleged crime.
The judge also prohibited Ortiz from working as a speech pathologist in California, a spokesperson for the DA’s office said.
Ortiz faces multiple other charges, including 10 felony counts of assault with a semiautomatic firearm and three felony counts of shooting at an inhabited dwelling or camper.
Each count of assault is associated with a person Ortiz allegedly shot at, according to court documents.
The criminal complaint, obtained by the BBC, lists the victims as Robyn Fenty and Rakim Mayers – Rihanna and A$AP Rocky’s real names – their three children, Rihanna’s mother Monica Fenty, and several others.
If convicted, she faces a maximum penalty of life in prison.
Ortiz has been accused of driving up to the front of the house and firing the weapon multiple times at it, then fleeing.
Her white Tesla was located about eight miles (12km) from the singer’s home at a shopping centre in Sherman Oaks, where she was taken into custody.
Ortiz’s attorney and representatives for Rihanna did not immediately respond on Wednesday to the BBC’s requests for comment.