While the film portrays Jenkins as having a fear of sharp objects, this is a fictional element added for dramatic effect. In reality, there is no historical evidence suggesting Florence Foster Jenkins suffered from such a phobia.
Jenkins' most well-known characteristic was her lack of musical talent, which she was completely oblivious to. She performed in public despite her inability to sing in tune, believing she was a gifted vocalist.
It's important to rely on factual information when discussing historical figures and avoid attributing fictional elements to their lives.