MIAMI -

Newly released evidence indicates 19-year-old Ivanna Villanueva was supposed to be a "designated driver" for her friends the night she is accused of driving drunk and crashing into a car driven by a South Florida grandmother, killing the woman.

In the account of events Villanueva wrote for Coral Gables police in the hours after the Oct. 2 crash, she gave no clue to what her blood alcohol results would eventually show: that she was almost three times the legal limit.

She wrote that it was her turn to be "designated driver" for her friends as they spent their night partying at several clubs inside the Fontainebleau Hotel.  Villanueva wrote that she decided to leave to make her 4 a.m. curfew.

On the way home on LeJeune Road near Majorca, Villanueva slammed her new Audi at 80 miles mph, police say, into Eyder Ayala's red Ford, which killed Ayala.

State's evidence also shows what police found in Villanueva's car after the crash: a plastic bag with what they suspect was marijuana, her passport and an Arizona state license, the suspected fake identification prosecutors think she used to buy cocktails during the night.

Bar receipts showed the 19-year-old not allowed to legally drink bought shots of high-end tequila that night.