Ashley Conner Young was sentenced to six years in jail for a June 2009 crash in Fontana -- in which she was found to be driving under the influence -- that killed Leyna Marie Basua.
Young is now facing a DUI charge that occurred in Beverly Hills just four months prior to the fatal crash.
The West Hollywood woman has been in a Los Angeles County jail in Lynwood since being arrested two years ago following Basua's death nine months after the crash. Young will receive credit for those two years on her sentence.
Young, now 25, failed to appear at an arraignment for the Beverly Hills DUI arrest and was never convicted. A warrant was issued for her arrest at that time and her driver's license was suspended.
It remained suspended four months later when she slammed into the car carrying 26-year-old Basua in Fontana.
Basua's family, still upset about the minimum amount of jail time Young received, brought the manslaughter conviction to the attention of Los Angeles County prosecutors, who decided to pursue charges on the first arrest.
If Young had been convicted of the first DUI, it could have been considered a prior conviction in the incident involving Basua, her mother Mary Santaibanez said.
"She could have gotten 15 to 25 years," Santaibanez said. "She got six."
Prosecutors said Young was driving at 1:30 a.m. Oct. 11, 2009, on the southbound 15 Freeway in Fontana when she rear-ended a Honda Civic driven by Basua. The collision caused the Civic to go off the freeway near Cherry Avenue and strike a tree, authorities said.
Basua and her boyfriend, John Martin, were badly injured in the crash. She died about nine months later from complications of internal injuries, authorities said.
"You can't forget," Santaibanez said. "It's hard."
Prosecutors said they will seek the maximum penalty for the earlier DUI incident - eight additional months in state prison. Officials and Basua's family would like the sentence to run consecutively with her current prison term, which means if she is convicted she would serve additional time.
"I want her to get more time," Santaibanez said after Wednesday's hearing.
"I just want justice, I want her in prison."
Basua's family has not missed a court hearing yet.
"It doesn't matter if we go to trial and lose," Basua's stepfather Victor Rodriguez said.
"As long as Leyna knows we fought for her."
Young remains in jail after pleading no contest to a felony count of gross vehicular manslaughter while intoxicated involving Basua's death.
San Bernardino County court records show four other felony counts and a misdemeanor count were dismissed as part of the plea deal.