FL Gets Sick or Injured, Suffers or Dies After Protecting ML

The FL is stabbed through the abdomen with a sword while protecting the ML, but seems to not be all that badly injured  minutes later...

ML saves FL from an assassin's attack. FL saves ML from falling off a cliff... until they both fall. She catches a branch to break their falls temporarily before they fall again and the FL hits her head and losses her memories. This is all classified as the FL saving the ML's life.