The issue was indeed a phosphorus deficiency from what I can tell. A few days after applying a soil drench of the bone meal etc, she stopped deteriorating. Thatβs not to say she doesnβt look like sheβs seen better days, but at least it stopped spreading. She should only have 2 or 3 weeks left.
I think she will make it just fine. Stuff does happen, but seems like you handled it quickly, and are taking good care of her. Wishing you a great rest of your grow, and an amazing harvest :)