Lorlie M. Gantenbein, 36, of Sagle, was charged Tuesday with felony injury to a child. She was released on $5,000 bail and ordered to have no contact with the baby's family.
The 2-month-old girl was recovering at home after being sprayed Monday, police Chief Mike Hutter said. The infant was treated at a hospital.
Gantenbein in a telephone interview on Wednesday denied using the pepper spray. She said her 16-year-old daughter used the spray, but did so in self-defense.
The victims told The Bonner County Daily Bee the second discharge was intentionally directed at the child, an allegation Gantenbein disputes.
Gantenbein said she bought the spray for her daughter as tensions rose between the two families after the Gantenbeins rented property to the baby's family and then evicted them. The feud escalated when her daughter began dating the baby's father, she added.
Monday's confrontation began at a gas station, but continued when the two families crossed paths inside the discount store.