Thats not fading, that is burning from being way over fed for too long and with a probable salt build up issue too.
Looks like a sativa type plant..........going to 11/13 can help to stop the re-flowerings (foxtailing) and get her to finish up more decisively.
I would stop all feeds and give just plain water in normal amounts and at normal intervals from now on until harvest time......probably in about 2 weeks or so.
No need to drown your plants with gallons of water in the misguided belief that "flushing" like that does anything beneficial, for this plant, it is too late to change the outcomes.