Police say Makenzie Rutherford died Tuesday morning after the crash left her in critical condition Sunday night. It happened near the intersection of Sublette and LaMoille roads.
Police say 34-year-old Brian Dees drove the ATV into a deer, sending it rolling into a ditch. Dees, Rutherford, and Rutherford's mother were all ejected.
Dees was cited for operating an ATV in the roadway.