I'm begging you, as an autistic person, as a parent, as a mother of autistic kids. Your therapist is wrong. Please, please listen to your daughter. Her health and safety is so much more important than trying new things on someone else's timeline! She'll try new things when she's ready and motivated to. That sick feeling in your gut that you have when she hurts herself - listen to it. She's autistic. No amount of therapy is making her autism go away, so if she's telling you 'this is too much', listen to her!