I think she didn't speak for five years after that. She experienced it as "I spoke his name and it killed him."
She learned the power of her words at an early age and it made a really huge impression on her. That no doubt was not irrelevant to her amazing career as a writer.
One reason writers agonize is because words can have power and because writing can be like doing therapy on stage while everyone watches. Good writing often contains some piece of the author's soul and that's always a risk to take.
It's not neurotic that some people find writing emotionally hard and all that. If you happen to have found your way to writing via a path that didn't leave you fearful of the power of your words, well, nice for you.
But "get off my lawn" as they say. (I generally enjoy writing. Get off my lawn anyway.)