I think it is better if instead of thinking of this as losing, we think it is a tactical retreat. As such, going SS2 is a terrible idea since it brings the enemy and either makes it so that we return to a pile of ash or Dandeer's thralls will train as if there is no tomorrow.
Our main advantage is that Dandeer thinks she won so once she seals us she will think we are out of commission while our shade does stuff. She won't be making contingencies against us if she doesn't know we are free. More importantly, Carrick won't be limiting our sight anymore.
I think our best option is future Kakara's plan. Don't try to free Jaffur since she will never rest until she controls him. We might want to warn her about the suicidal tendencies as a concerned friend to sell the impression she won.
Once we are a Shade, we go to the otherworld, ask Piccolo where Namek is, find their sorcerers and ask to wish on the Dragonballs to break everyone free from Dandeer's control.
That should be enough to turn this around as long as she doesn't know what we are doing. She did well here because she had 7 years to prepare for a confrontation but if she doesn't know to prepare for this...
Come to think about it, the exile sorcery system is less than 300 years old.
@PoptartProdigy has any exile even attempted mind control before Dandeer? That might be why Dandelordidn't think about it.
That said, if leaving is unpalatable and people are set on Dandeer dying... well, future Kakara said the spell was to prevent us from moving so in theory we could use telekinesis to break Dandeer's neck. We would have to pass a couple of ki control checks against Yammar so the he can't detect or stop it though.
