So, I understand that she was fired and that's why Diana Muldaur took the doctor role in season two, but why exactly was she fired? Do we know? How did she get her job back? Jumping in-universe, why would Dr. Crusher return to the Enterprise, after being appointed to such a high rant at Starfleet Medical? Seems like sort of a monumental thing to use a write-off for an unwanted character.