Almost three hours after Kayla Mendoza, 20, of Hallandale Beach, Fla., tweeted " 2 drunk 2 care," her car rammed head-on into another vehicle, allegedly killing two young women in the other car, according to the Florida Highway Patrol.
Best friends Kaitlyn Ferrante and Marisa Catronio, both 21 years old, died in the crash last weekend.
Mendoza's car was traveling on the wrong side of the highway when it collided with Ferrante's car, according to a report from the Florida Highway Patrol.
"It is unknown at this time if Mendoza was driving under the influence," Sgt. Mark Wysocky of the Florida Highway Patrol told ABCNews.com today.
Ferrante was taken to Broward Health North Hospital but died two days later, Wysocky said. Catronio was pronounced dead at the scene.
"This morning they took her heart and she gave her heart to someone else," Ferrante's mother told ABC affiliate WPLG Thursday.
"She saved a life and now they are breathing and alive because of Kaitlyn," Ferrante's mother said.
Wysocky told ABC News that authorities were awaiting the results of the toxicology tests before charging Mendoza.
Kayla Mendoza, who spells her first name "Kaila" on her Twitter account, is being treated at the same hospital where Ferrante died, and has progressed from critical to fair condition, said Wysocky. Mendoza's family did not immediately respond to calls and emails from ABC News requesting comment.
The cause of the crash is still under investigation, Wysocky said.