Talking therapies have not worked at all for my neurodivergent young person - they were never able to trust the therapist or open up to them despite being highly articulate.
Non-verbal modalities, especially art therapy, have helped instead as it enables them to express big, scary, sad, and traumatic things without having to find the words to explain.
With trauma, they say that the person regresses emotionally to half their age, which is why therapies that don't involve talking are often better for young people. My young person is 13, but when triggered by trauma is like a much younger child - art therapy provides the sensory resources, space, and expressive opportunities to be emotionally more like a 6 or 7yr old.
Talking therapies need an ability to be able to understand what your feeling, reflect on it, and work out how to make changes. This is hard enough for many neurotypical young people as their brains are still developing those skill, but even harder when you're neurodivergent - rigid thinking, wobbly empathy, difficulties understanding body sensations and emotional sensations, etc, all present huge barriers to talking therapies.
An appointment with an interoception trained Occupational Therapist might be worth considering. Ideally, someone trained in Kelly Mahler's Interoception Curriculum who can lay the groundwork before deeper emotional therapy can take place. Then, it could be an idea to look for a specialist therapist who uses non-verbal modalities and has specific experience in working with neurodivergent trauma and EMDR.