I think no worries...it's going to drop all the yellow leaves and will make new ones if she needs them. at this point the leaves are beyond coming back but I don't think you need to worry at this late stage of flowering.
I think this is a over watering/flushing consequence and all you need do now is just maintain 'normal' feeding and watering.
The pH is FINE @ 6.5 No worries. It's just exhibiting yellow from the flushing they got.
I once had an accident in my grow space where the pump was on nearly 6 hours straight and so the roots were irrigated all that time. After a week or so they started to look like your leaves. Once I let things get back to 'normal' the leaves continued to yellow and drop but new ones grew to replace them, took several weeks and I worried the whole way too. Yeah it does take a bit of energy away from flowering but hey you'll still get good flowers, just a little later, delayed. Relax have a cold one and talk nice to her. She's got some flowers going! Have Fun, Happy gardening! GrowIT!