I must not have read your first post through, eh?
If you wish to keep her in her bed, maybe give her books and a reading light. I did that with my son at that age; he was allowed to stay up and look at his books IF he stayed in bed. At least he was learning a viable routine. He still goes to sleep by reading first - now he can, of course, actually read 
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).