what if she was actually referencing Harry Dresden of the Dresden files?
What if a million things? What if, she told her idea, and someone took it, and put out a story with a similar boy, in a similar story, with similar ideas, and it caught on? I bet Mrs. Rowling she would care.
There are many ideas that were the first of their kind. And if you think you got one, you wont share. And many circumstances lead to an idea that can only hit once, and then it is spent. It would not be wise to let it out too early. But I wont stop you from sharing if you like.
The issues I have with the thinking above is the same as ever saying something is all or nothing. That should be a red flag in any position. Maybe it is true for 999 out of a 1000, or 999,999 out of 1 Million, but for that 1, I cannot subscribe to the above. I can only mostly subscribe to it.
When the Idea is mine, and I am not seeing it anywhere else, and I intend to use it, I am not sharing.