It really isn't all that bad, sure like others have said, even in flower you should keep giving them a bit of nitrogen. But like I said it not that bad because there is lots of green still within the bud area's that the plant could easily make it another 3 or 4 weeks without it losing to much yield! But it definitively would still be a good idea if you were to give the plant at least 2 ml of Holland Secret Grow, if that is what you are using, anytime you were to feed her up until a week before the flush! And next time, to keep your plants green all through flowering give them at least 2ml of a good nitrogen base like Holland Secret Grow even if the feeding schedule says to stop!