In the movie Big Eyes (2014) when asked by her then boyfriend Walter about why she paints the eyes so big that they are way out of proportion Margaret Keane explains it as "When I was little, I had surgery that left me deaf for a period, and I couldn't hear, so I found myself staring. I relied on people's eyes."
When I've searched the net after watching the movie about Margaret Keane's life story I couldn't find any reference to this quote. Her own explanation for the inspiration is : "Children do have big eyes," says Margaret. "When I'm doing a portrait, the eyes are the most expressive part of the face. And they just got bigger and bigger and bigger."
So my question is about the background of Amy Adams' line in the movie about the reason for the big eyes. How were they added into the script? The real Margaret Keane was sitting just behind her on the park bench in that scene.