And as noted by me and another poster, separately in the comments, it makes you wonder whether the stigma of that diagnosis moved her to make sure that everyone knew that she did not have THAT diagnosis. I mean, she didn't but it's not like she went out of her way to dismiss rumors of drug addiction or bipolar disorder or any other host of possible causes for her erratic behavior.
Now I will note that I'm all for her privacy—this isn't the issue. What is problematic is the widespread view of people who have Schizophrenia as being scary and dangerous.
It's pretty widely known that Schizophrenia has far more stigma attached to it than any other diagnoses with few celebrities or people championing its cause. It strikes almost 1 out of 100 people (approximately) and yet it seems almost invisible because no one talks about it.