i say she's done her job, made seeds and is now dieing,
how did she get up the duff, did u have a male,or a hemi.
if its not a hemi you could cut her back to the bottom bits that are still good, then re-veg her.
Yer u could sing to them, mite make them feel better, but with your singing skills it mite not.
All u can do is give them time to come right,
Good luck
Yer i know i was thinking the same thing.
A preson i know dose st8 hydroton, say's it works for him just aswell as his coco ones.
He has to water 2 times a day till his roots get down to his tray, then only once a day.