In July 2014, Principal made a substantial contribution to NRDC's campaign for Save the Bees. She stated, "As of yesterday, I've now made a substantial donation and joined in support of the NRDC's campaign for Save the Bees. Without bees, our fruit- and vegetable-bearing plants and trees will cease to be productive." In August 2014, she fully funded with, the help of Mission K9 rescue, the return of military working dog Maxi from Japan to the United States to be reunited with her former Marine handler. Two months later, she donated $100,000 to support Malibu ballot initiative Measure R, which sought to limit the environmental impact of development in Malibu by requiring a vote on any new developments over 20,000 square feet. In November, the initiative was passed by voters.