By Kevin Dolak The woman accused of firing an assault weapon at Rihanna’s Beverly Hills mansion earlier this month has pleaded not guilty in Los Angeles Superior Court. Ivanna Lisette Ortiz, 35, of Orlando, Florida, entered her plea on Wednesday morning at L.A.’s Clara Shortridge Foltz Criminal Justice Center, according to court records viewed by The Hollywood Reporter. Previously, Deputy Public Defender Derek Ray Dillman had entered a not guilty plea on her behalf on March 11; it was later withdrawn in favor of postponing the arraignment. Ortiz has been charged with one count of attempted murder, 10 felony counts of assault with a semi-automatic firearm and three felony counts of shooting at an inhabited dwelling or camper. She is being held on $1.875 million bail and could face life in prison. Dillman asked that Ortiz’s bail be reduced from $1.9 million to $70,000 based on her ability to pay, but Judge Theresa McGonigle declined the request.…