Now that I returned from work...I'm still bothered that Jeff chose to completely ignore the fact that Malia shouldn't be this coherent but I've come to the conclusion that she has to be connected somehow to the Nogitsune. And if she was the original host f.ex. it would explain why she's so mature. It seemed a bit too convenient that she was everywhere where Stiles was and knew her way around the hospital. Maybe she tricked him into letting the Nogitsune take over completely? So many thoughts and theories.