As Miss Teen USA, Hennig represented the Miss Universe Organization. Her "sister" 2004 titleholders were Jennifer Hawkins (Miss Universe, of Australia) and Shandi Finnessey (Miss USA, of Missouri), with whom she made appearances, which included a trip to Bangkok, Thailand. During her reign Hennig made numerous television guest and public speaking appearances, including a guest appearance in the NBC soap opera Passions which was part of her prize package. Hennig also worked with a number of other non-profit organizations, including Seeds of Peace, D.A.R.E., Sparrow Clubs and SHiNE.