Authorities say the mother was attacked with a small wooden baseball bat at her home Thursday but escaped.
Deputy Police Chief Mike Barnett says 18-year-old Nikita Lee Weis was arrested on suspicion of conspiracy to commit first-degree murder.
Also arrested on the same charge were his girlfriend, 21-year-old Sophia Nicole Alsept, and the two men he allegedly hired. They are identified as 18-year-old Juan Antonio Velez Gonzalez and 19-year-old Brandon Michael Soroka.
All are being held on $50,000 bail.