She paid $10,000 (NZD $14,461) in bail and was released May 11 after entering not guilty pleas.
But because Clarkson died afterward, the Florida Highway Patrol now intends to arrest Welk on an upgraded manslaughter DUI charge, the assistant state attorney for Marion County told The Washington Post on Friday.
At the scene, Welk told police she was distracted after dropping her cellphone before she smashed into the vehicle, the Florida Highway Patrol said in an arrest affidavit provided to The Post.
She also believed that the road she was driving on was an entirely different road, the document shows. Welk crashed into a car driven by Clarkson's 18-year-old daughter, Shiyanne Kroll, who suffered minor injuries, Village News reported.
Welk, whose blood-alcohol limit was twice the legal limit, was uninjured in the crash. She could not be reached for comment.
Kroll and her sister, Keonna Sciacca, told Click Orlando they were devastated over losing their mother and repulsed by Welk's ear-to-ear smile.
"That disgusts me, and that means she has no remorse for what she did at all, and I hope that judge sees that picture and says the same thing," Kroll said.
Sciacca wept over the loss.
"It's definitely wrecked our family forever, not just temporarily, this was a permanent thing that [Welk] did. … I can't hug her, I can't tell her, 'Goodnight, I love you,' " Sciacca said through tears. "It's destroyed us."