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I wish I could diagnose exactly the problem your lady has, but honestly at this point there is little you can do to fix the situation in time, not that it would not help to ensure they are fed enough till they are done, or fed less till done if the problem is from overferting.
It is just that you have 3 weeks left, and by the looks of the lady now there is very few leaves left that can actually help photosynthesis to take place.
If you get the situation corrected the plant will not have enough new growth by the time of harvest to help the plant recover.
The more I look at the pics the more I am starting to think it was just a N deficiency, you can see the chlorosis, and see where the plant was feeding on itself.
Determining exactly what caused the N deficiency is not really easy though, because the plant can get too much and cause lockout of nutes, or it can get to little N, both will look similar because they both are deficiencies, but by different causes, hopefully that makes sense.
Next time you see this starting to happen I would try to dilute a little bit of blood meal in your water, and watch for new growth on the upper half of the plant, if after a week or so you see no recovery, then underfeeding is not the cause of your N deficiency.
I'd think then it was either over-watering, or maybe the soil has a high build up of total dissolved solids (TDS).
Sorry I was not able to be more helpful, I am not the best plant doctor, but I have grown for a while, and have dealt with a few plant issues in the years I have grown.
The damaged leave will never recover, and will eventually fall off of the plant.
Well thats funny. Exactly what i was thinking. Iv been soo busy lately by the time i get back home the lights are off. So i reckon its just been a deficiency, i forgot how much i should be feeding it so wasnt giving it enough, just when it needed it when starting to fatten up!
Bastard eh lol ah well the 2 clones are doing ok might get some nice smoke off them.
I fed the sick plant 3mlgrow and 3ml bloom yesterday so we will see what happens.