hey bro i had one like that and it didnt start growing until i bought a liquid root hormone and fed it to her...a couple days later she was growing.....mine was due to transplant shock. hope this helps
Damaged tissue won't regenerate, but if conditions are ideal the plant can bounce back, what hasn't already been lost. It will just take awhile to make its come back.. Good luck!
I think if you just giv'r some time she should be fine. Perhaps she's just a late bloomer. If your other plants are doing well, your obviously not screwing it up -- so give it time and see what happens.