Looks to me as though you may not be meeting your gals needs fully or you may be suffer from some kind of lock out. a 6.5 PH is good for soil, so I'm going to have to lean more towards your nutes. What are you feeding her and what is your feeding schedule?
as of now nothing just keeping track of p.h. fed for magnesium and sprayed leaves with a 2% epsom solution to try and raise magnesium up. Hopefully that is the only problem. but during flowering what is the best nutes/feeding schedule.