agree with GroIT looks like nut burn. are the clones from ur first grow? if not then they could be reacting badly to the soil, if they are from first grow then it could be the soil. It looks like the plant is getting more nut's from the soil than it needs and by adding more is only making things worse. How many weeks is miracle grow soil pre-treated with nut's for I have seen soil out there that has been pre-treated with up to 6 weeks nut's which is pointless because we want to use our very expensive products like veg and flower nut's from our local hydro stores or am I wasting my money . I would give her just water for a week or so, look for new green shouts starting to appear and u should be all clear remember the leaves that are damaged will always stay like that and never get better which is why we look to new growth for signs of good health or problems.