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.
Reading Festival 2017 Aug 25, 2017 Reading, England, United Kingdom Uploaded by Tom.M
2000 Trees 2017 Jul 6 - 8, 2017 Cheltenham, England, United Kingdom Uploaded by Blossom Baphomet
Poster
Firenze Rocks Festival 2017 Jun 23 - 25, 2017 Florence, Tuscany, Italy Uploaded by Nurz