Ivanna Lisette Ortiz, of Orlando, who had no prior police record, also pleaded not guilty to more than a dozen other related charges in Los Angeles Superior Court.
Hours after her arrest on March 8, Ortiz told detectives she would not answer questions without a lawyer, but spoke up once, according to the Los Angeles police report made public in a court filing.
"Can I say one sentence?" she said. "I would like to say that I wasn't attempting murder. But that's all I wanted to say."
Police and prosecutors said that Ortiz, 35, pulled up in a white Tesla to the home Rihanna and A$AP Rocky share with their three young children in the Beverly Hills area, pointed the rifle out the window and sprayed at least 20 bullets toward the property and a neighbouring home. No one was injured.
Rihanna told detectives that Rocky was sleeping in the rear of the trailer that was parked in the driveway next to the home's garage and she was sitting at a window seat when she heard about 10 loud sounds like something banging on metal.
She pulled back a curtain and saw bullet holes in the Airstream's front window, according to the report. She pulled Rocky out of bed and both of them got on the floor before running into the main house to check on the people inside, which included the kids, her mother, and staffers.
Rocky told police that Rihanna shouted that someone was shooting at them as she woke him.
Two bullets hit the double-paned window of the Airstream, but did not go through it, the police report said. A third appeared to have hit the trailer's side.
A bullet hole was found on the exterior wall of the home's second-floor nursery where the three kids were with their nanny.
Three bullet fragments were found in the home's front porch area while at least 10 bullet holes were identified in the property's gates and walls. Shots also hit a neighbouring home.
Ortiz is charged with 10 counts of assault with a semiautomatic firearm, one for each of the people on the two properties. She's also charged with three counts of shooting at an occupied vehicle or dwelling for the trailer and the two neighbouring homes.
She could get life in prison if convicted on all charges.
Ortiz appeared behind glass on Wednesday, wearing yellow jail clothes with her blond hair in braids. She spoke only to agree to waive her right to a speedy preliminary hearing, the next phase of the case where evidence is presented to determine whether a trial is warranted.
Her lawyer, Deputy Public Defender Derek Dillman, asked that her bail be reduced from $US1.9 million to $US70,000 based on her ability to pay. Judge Theresa McGonigle declined the request.
The prosecutor said she's a major risk to the community and would likely flee if she made bail.
District Attorney Nathan Hochman declined to discuss a motive or describe any connection between Ortiz and Rihanna, saying all were under investigation.
A nine-time Grammy Award winner, Rihanna has 14 No.1 hits on the Billboard Hot 100, including We Found Love, Work, Umbrella and Disturbia. She founded the makeup brand Fenty Beauty in 2017.
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