Nancy Iskander’s youngest two sons, Mark, 11 and 8-year-old Jacob were killed while using a crosswalk in Westlake Village in September 2020.
The woman charged with their murder – Rebecca Grossman - formally entered pleas of not guilty on all charges and denied all special circumstance allegations, on Friday.
She is charged with two felony counts each of murder and vehicular manslaughter with gross negligence, along with one felony count of hit-and-run driving resulting in death.
Grossman remains free on $2 million bond.

Outside the court, the mother of the boys, a tearful Ms Iskander, told KCLU that it’s been a nightmare.
"Today was another step in the hard journey and Mrs Grossman chose to plead not guilty again of anything that happened and not take responsibility," said Iskander.
"As a mom it's just a nightmare I never thought I'd go through. The loss of the boys was a huge cross for me to carry.
"And then the time - the year and half and then another year maybe to see any justice, is another cross," she said.