This is the same perm I have always used. It kind of smelled funny when I opened it but I went ahead and used it anyway. I just rinsed the conditioner out and it is much better. Not as hard and poofy. And there are not clumps coming out any more. I don't know what was wrong. She lost a lot of hair though. She will probably have to have it cut. I want to figure out what I did wrong so that I don't do it again.
Well since you say it smelled a bit off, check the box and see if there's an expiration date.
As far as figuring out what you did wrong, was the hair coming directly from her scalp? Or was it broken pieces coming from somewhere along the strand?
If it was coming from her scalp I would say either her scalp can't handle the relaxer anymore or there's something about that relaxer that had a negative effect this time.
If there's breakage from the length it could be from overprocessing (from the relaxer runoff or from overlap), not handling her hair gently during the process (especially if it wasn't detangled well beforehand), or her hair being too weak to handle a relaxer right now.
There are lots of factors that could have caused that outcome so try to go over the process and what she's been doing recently to her hair.