When Chester mills had the visitors day, her knowdlege of sign language allowed her to facalitate communication with the people on the outside of the dome. 
Dodee saw Big Jim listening to the radio and heard from the military that Big Jim murdered Coggins, and when she told him of the mini-dome's location, she threatened him that one day the people will find out about his sins. In retaliation, Big Jim shot and killed her.
- Under the Dome:
- "Joe's Blog":