She didn't wake up or really get up until 11 o'clock the next morning.
Her sister, Taylor, is also a very talented swimmer.
Simon is likewise devoted to River, and often feels that Mal is flippant with her, and unconcerned with her safety.
The injuries were caused by a ferocious assault.
Hence, her knowledge of the language.
Because of Simon and River's need to stay on the move in order to outpace the Alliance, Mal Reynolds offers Simon a job as doctor on the Serenity, and Simon accepts.
Because of his intense dedication to her he hardly makes any personal connections on Serenity when he first arrives, focusing entirely on his sister's health.
A few months into his sister's stay at the academy Simon began to get strange letters sent to him from River.