Severe Dissociative disorder. I try?

My mother has been having dissociative seizures daily for the past 6 months. During an episode, she suddenly closes her eyes, becomes completely unresponsive, her right hand shakes, followed by heavy complete body shaking jumping hurting herself unknowingly and side-to-side head movements for 20 mins. She does not respond to sound or touch throughout the episode. She has also been seeing black shadows and hearing whispers once or twice a day. She has been under psychiatric treatment for 5 months. Previous medications (Daxid 50 mg and Quetiapine 25 mg) did not help. Now taking Duvanta 20 mg (afternoon), Duvanta 30 mg (night), and Zolfresh 10 mg (night). The hallucination-like symptoms have reduced, but the seizures remain unchanged not even 1% reduced. She is also unable to sleep without medication. Is this condition treatable? i want her to be cured doctors. What else should i try ? please help me find a solution.