Investigators say Loofe spent the evening with 23-year-old Boswell.
It was a second date for the pair who met on the dating website Tinder.
They began exchanging information on the case when Doody's son called.
When the date was over, she says she went to take Loofe home, but she asked to be dropped off at a friend's house. She added that she 'didn't have anything to do with' her disappearance.
At the Tuesday morning press conference, investigators said they haven't been able to confirm any of the claims made in the social media video.
They added that they have been speaking to Trail while he's behind bars.
Before they were arrested last week, Boswell and Trail released a bizarre video in which they claimed innocence in Loofe's disappearance.
Officials gathered for a news conference Tuesday in Albion to say Marion Cooley and Charles Doody - both long dead - had shot Boone County Sheriff Lawrence Smoyer and Boone County Constable William Henry Wathen outside a ranch near Albion on June 17, 1937.