Prosecutors said Elizabeth Long's BAC was 0.252 shortly after the crash which killed Mary Warren, 22, of Fort Collins. The new details were revealed during an advisement hearing for Long on Tuesday.
Prosecutors have charged Long with vehicular homicide, vehicular assault, leaving the scene of an accident, and DUI stemming from the July 5 crash at I-25 and 58th Avenue.
Prosecutors say Long was going 75 mph before the crash and made no attempt to brake before the impact.
Long, who is currently out on bond, wept openly during Tuesday's court hearing.
Judge Byron Howell decided to keep her bond at $10,000, despite a request from prosecutors that he raise it to $50,000. Howell said he felt comfortable with Long's defense assertion that she would remain in an inpatient alcohol treatment program for the time being.
Long apparently voluntarily checked herself into a facility recently.
Long was surrounded by family and friends at the hearing and she said nothing as she left the courtroom.
The judge has ordered her not to drive. Her attorney, Forrest Lewis, told the judge his client "has no desire to drive her car anywhere."
Prior to the accident, Long had a clean driving record. She holds an MBA and owns her own consulting business.
Many of the victims in the case were in the courtroom on Tuesday.
Investigators believe Long's 2008 Toyota Rav4 struck "multiple vehicles" before slamming into a car driven by Jonathan Swanson, 32. Swanson survived the crash, but Warren, who was in the passenger seat, did not.
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