Demers is a particle physicist. As an undergraduate she worked in the laboratory of Melissa Franklin and made sheets of gold-coated Mylar into detectors for tracking elemental particles. Her work examines charged particles to find new methods in physics beyond the accepted Standard Model. Demers was part of the team who discovered the Higgs boson, and her work is conducted at the Large Hadron Collider. Demers also works on the ATLAS experiment and the Mu2e experiments.