I always have an eye on her (unconsciously\ without being noticed),such as what she is doing, whether she is listening the lesson or not, whom she is talking to and so on.如果“无觉察”指的是自己没有意识到自己在关注她,那么就用unconsciously 如果“无觉察”指的是自己是在她没有觉察到自己在关注她,那么就用without being noticed。