Need help

can you add a picture of the roots? what happened that she got into this situation in the first place, do you know? did you fill up the reservoir too much (so she was drowned) and the air-stones were clogged and she didn't get any air? broken pump? First the roots need to "correct" themselves, so you said that she's showing new roots, so that's good! If there are dead roots in the solution/on the root-ball, then i would suggest adding some enzymes, so they can be changed into food for the plant. If the leaves got too affected, then they might not recover (similar like with deficiencies), but that doesn't mean that the whole plant won't recover.. it just then needs time to strengthen itself again and produce new growth that can be healthy again.