The branching on the 'big' one is much more (longer) than I usually leave for re-veg. With sativa dominate strains, it's easy to leave too much branching, especially since the undergrowth tends to die-back during the flowering process. Is this why you left it so long? The best remedy I've found for this situation, is to plan ahead in flower. Removing a yellowing fan leaf or a small branch (to give light to the undergrowth) will start the plant filling-in the bald spot with new foliage, if it can get some light. A tad too late for that now, but it might still pull-through.

Perhaps give it a few more days of 'normal' treatment. (regular watering and feeding) but perhaps raise the lights a tad to give her some time to heal. Make sure the roots don't get cold at night.
No additives till she starts showing new growth at the internodes.

Did you flush her when you re-potted? If not, the old flowering nutrients can affect the growing process, especially if you've started giving her the growth nutrients. (overdose symptoms)

Is there any new growth showing at all?

The small one looks more like what I do with the re-veggers. It'll pump-out those shoots nicely. :thumbsup: