KKL probably didn't drive that route, either. My guess is that she drove I84 to Salt Lake City, then I40 to it's end at Bear Mountain junction just outside Rocky Mountain National Park (picking up aunt K en route), Colorado Highway 14 to Loveland and US34 in to Greeley. Then KKL would most likely have driven US85 from Greeley to Denver, which merges into I76, then taking I70 in Arvada (Sheridan Boulevard) to US 285 at the Bear Valley Shopping Center exit, then to Colorado Highway 126 (Pine Valley Road) to Deckers, and Colorado Highway 67 to US 24 in central Woodland Park, then to Starbucks for the Latte Machiatto, and back to KB's.
She was looking for a horse trailer with her aunt, the weather was nice and the roads were good, and there was much less construction. Bungling an Ambien slip was a very short side trip. IMO