Maybe too many nutes? Is that an aeroponic system?
But to be honest she doesnt look to be "dying", just a bit under cared for and in need of some love. Get your light close, run a flush run of plain water ph'd to whatever you run your res at (mine run's at 5.0-6.0), you can put a couple of drops of hydrogen peroxide (1tsp/5gallons) to take care of the roots. Once you've given them a day or so of that give the plant the GH nutes, all three parts 1 tsp/gallon and run her on from there, let her do her thing. Keep the system clean, change the res every 3-7 days, keep ph between 4.8 and 6, make changes to their diet slowly. Make sure you can accurately measure ppm and ph. From what I know thats all I can say.