My 23 yr old daughter was found yesterday unresponsive. emts gave her propofol and inserted a breathing tube. tox screen came up negative.?

Long list: Sorry, but this forum is too broad for such a discussion. While toxic ingestion is possible, other metabolic, cardiac, neurologic, and possibly other organ system etiology is possible. Further testing and evaluation will give you a better answer.

I'm Sorry!: Forgive the delay in you receiving a response in this troubling situation. I'm hopeful that the causes for your daughter's unfortunate event are currently under review and that a treatment plan has been undertaken. The possibilities here are numerous and consultation with her care advisors and an open discussion is very appropriate. Good wishes out to you both!