Detectives began investigating Kacy Christine Wilson in October when they learned she was possibly having a relationship with a 16-year-old, police said.
The teenager initially denied the relationship and detectives attempted to interview Wilson, but she resigned and moved to Colorado. The case was inactivated due to lack of evidence.
Last month, the teenager told school officials about his relationship with 28-year-old Wilson, police said. The teen spoke with detectives and also provided investigators with inappropriate photos Wilson recently sent him.