can solo her with dark team, someone in my union is killing her with a water team and thor.

Is there really a need to discuss something that gets steamrolled that hard?
Short version, try to prevent enraged nuke at all cost, use joan with other damage cuts for the nukes, kill it as fast as possible. Charm and blind work wonder to reduce overall damage taken, if this does not work, dispell atk up atleast, you can still survive several tripple hits if you can manage to dispell the atk buff.