I’ve seen people talk about actors and artists that had a terrible time.
My own would be Anne Rice. She wrote Interview with the Vampire after her young daughter died of Leukemia. Then her husband suddenly died of a brain hemorrhage. I suspect her Christian, anti-fanfic phase was a result of mental illness and manipulation from the publishers, although I don’t think she ever apologized.
I haven’t proved your point exactly, or even vaguely. Your assertion - that she was somehow forced into writing more books than she was ready for by a sudden passionate fanbase - is simply incorrect. She chose to accept a contract that obliged her to turn her single book into a trilogy.