There is absolutely no way any of us here can diagnose your daughter. That said, to me it sounds like she has some form of possibly severe mental illness going on. The lack of hygiene and wearing heavy fabric in the summer heat are red flags.
My daughter is 34...all we can do is tell them that we're concerned about specific behaviors and ask them if they're concerned, and it sounds like you have done that. At the age of 37 there isn't anything else you can do, expect to voice your concern.
Does your daughter have a husband? Children?
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