After getting bit by several genetically modified snakes in the book, Clemensia starts to become snake-like, growing scales over her body.
In the movie, a solitary snake bites Clemensia before she's taken away. Dr. Gaul advises Snow to keep that information to himself and pretend she came down with a terrible flu. She's never mentioned again.
In the book, Clemensia returns by the end of the games and is angry with Snow.
"We never shot it, but it was definitely cut. It was cut for length," Lawrence told Business Insider of why we didn't see Clemensia's transformation on-screen.
"We had to make some choices of, who are the characters that are most important to this movie," Lawrence said, referencing seven characters — Snow, Lucy Gray, Sejanus, Tigris, Dr. Gaul, Highbottom, and Lucky Flickerman.
He added: "As soon as you start to invest too much time in people like Clemensia, as fun as it is to see in the book, it expands an already long script. That was something that was excised, I'd say, quite early in the adaptation process."