Alexandria Duval, who is also known as Alison Dadow, intentionally caused the death of her sister, Anastasia Duval, also known as Ann Dadow, prosecutors say.
The 37-year-old sisters, who run a yoga business called Twin Power Yoga, were traveling south on Hana Highway on May 29 when their Ford Explorer crashed into a rock wall last week, plunging about 200 feet onto a rocky shoreline, police said.
Anastasia Duval was pronounced dead at the scene. Her sister was taken to a hospital in critical condition.
Court documents say the vehicle's air-bag control module shows the driver didn't attempt to brake before accelerating, making a hard left and crashing into a wall.
One witness said Alexandria appeared enraged before the crash that left her sister dead.
Witnesses saw the two women arguing while the vehicle was stopped and said the passenger was pulling the driver's hair, Maui Deputy Prosecuting Attorney Emlyn Higa said.
Alexandria Duval's defense attorney says she wasn't trying to harm herself or her beloved sister.
But she was arrested on Friday because authorities found out she was trying to leave the state.
'We had information after she was discharged from the hospital she attempted to fly out of the jurisdiction Wednesday night,' Higa said, adding that she tried again Friday, prompting police to arrest her.
'All we know is she was trying to leave the state. We were afraid she would try to leave the country as well.'
She appeared in court on Monday with her arm in a sling, said her defense attorney, Todd Eddins. A judge ordered that she continue to be held without bail. A preliminary hearing is scheduled for Wednesday.