Half her face was paralyzed.

> "When people lose their ability to express their emotions on their face, it really has profound effects," Byrne told ABC News. "It affects not only how you feel about yourself, but it has dramatic effects of how people respond to you. It's a really difficult way to go through life because you don't' get the responses from people that most of us do in everyday situations."

Not having “normal” facial expressions would negatively effect her socially and professionally throughout her life.