I would flush them one more time thouroughly, and then I might try re applying the lowest dose of nutes possible, I'm talking like 1/8th or less the normal strength dose. If new growth shows up after a day or 2 then continue, however if the plant worsens then just keep giving non-nuted water and hope for the best.
Instead of using strong fox farms nutes, you could try giving her some water mixed at a ratio of 1 tablespoon per gallon of mollasses. Its a good thing to give towards the second half of flowering as it can add 20% more weight to the buds. It can even be used in a plant food by itself in some cases.
Heres a video featurning the same mollasses I use myself.
http://www.youtube.com/watch?v=tcOyGd6Rwig
heres a link to some stuff on the nutrient problems for you as well.
http://www.growery.org/forums/showflat.php/Number/234999
Also, how many gallons is that container shes in? It looks kind of small for how big she is, a good rule of thumb is 1 gallon per foot of plant.
I would recommend a bit more research into deficincies if I were you, this website is quite a goldmine of knowledge, all it takes is some looking around.