Meade County State's Attorney Jesse Sondreal said Wednesday that 45-year-old Marguerite Engle was found slumped over the van's steering wheel along a highway on Dec. 1.
He says the highest blood alcohol content state chemists he spoke with could recall was a .56. The state's legal limit is .08.
Authorities say Engle missed an initial court hearing Dec. 15, but that they found her Monday in another stolen vehicle, and that she had been drinking.
She was being held on two counts of driving under the influence. It wasn't immediately clear if she was facing other charges.
Her attorney declined comment.