Did you try a cure wounds spell or potion on her ? It's the way that the unconscious druid in the tunnel witrh the guardian statues can be woken up.
Yep cure wounds , potions she is still knocked out with the guards watching over her.
Another thing to try (if you have not done so already) is to take a long rest ? When you leave camp and teleport back to the prison, maybe she's back up.....
