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Looks like a very late phosphorous deficiency to me, but your plant looks like it's still in veg which makes me wonder about your pH. Are you positive of the 6.5, cause that sure looks like a lock-out situation to me. What are your temps? Regardless, that girl looks pretty far gone, I doubt it will make it.
When you were checking pH, were you checking the pH of the run off water? Testing the run off will give you a better idea of what pH the plant is living with.
She seems pretty far gone though buddy, I'm not too confident she will make it. With problems like that early in flower, you will see a reduced yield in the end. Just a thought, it may be an idea to just chuck her out and start over.