Yeah, you should of just cut the end off the cup and let it grow down itself, then u split the cup down it's side and pull it up. Your meant to have as little impact on them as possible.
Did you try sort roots out? How did you transplant? Did you mix a 2ml root stim, soak the soil cup end the cup into your hand and place it straight into a hole and push soil around it?
Or did you: thinking you could place the roots better and spread them out? If so, you are just seen shock that all. She's stalled. Happened to my TANGERINE DREAM, transplanted it badly with a N tox and into a dif substrate, completely shocked the shit out of it, takes a few days before it kicks in, espically with soil grows, everything is in delay mode, like tox, defs show early on coco/DWC and its much easier to grow and much more forgiving for mistakes, soil, not so much.
What have you got? Hmmm, the stress is done brother, your just chasing your tail. You need to stay ahead of it. Since she's still a seedling, keep her on a light feed. Have you any root stims?