Besides being the role of female actress Juliette Lewis in the Oliver Stone film "Natural Born Killers" there is more than one artist with this name (see links in the Wiki sources):
These are photos from concerts where Mallory Knox played, so they may be of other bands that played the concert as well.
Vans Warped Tour 2015 Jul 30, 2015 Bonner Springs, Kansas, United States Uploaded by Kansas City Concert Fiendz
Warped tour ‘15 Jul 29, 2015 Noblesville, Indiana, United States Uploaded by Annabellewalker
Vans Warped Tour '15 Jul 28, 2015 Milwaukee, Wisconsin, United States Uploaded by Ben Piechowski
Warped Tour 2015 Jul 25, 2015 Tinley Park, Illinois, United States Uploaded by Wolfsam25
Warped Tour 2015 Jul 25, 2015 Tinley Park, Illinois, United States Uploaded by Dani Rae Carter