Hey everyone, so I've had my cat since she was about 2 months old. She's one year now. Shes been spayed for several months now but recently she refuses to be locked inside. I have three other cats. They're indoor/outdoor cats and I always make sure they're inside when the sun sets. As of late she's gotten very aggressive amd refuses to be locked in. She starts to growl and attack any other cat that comes near her. Even her sister/littermate. She used to be a very sweet cat but now she's mainly aggresive, only wanting to be home to eat and then out again. She roams and will stay out whole day all of a sudden. She's the only one who behaves like this. Does anyone have any advice as to what may be causing this behavioral change and how i can get her back to her sweey self.