My ~4 year old orange tabby saw a cat out the window of my studio about a month ago. Usually she puffs up, yowls and runs around trying to get to it, but last month she ran toward me and hissed, jumped at me, and tried to attack me until I was able to wrap her in a blanket and put her in the walk in closet with her bed, food, litterbox, etc. I thought this would be a one time thing but for the last month she has done this nearly every day, sometimes 3 times a day. She is spayed and there are no other animals in the apartment. I have completely covered all of the windows with frosted window film, I've got 2 Feliway diffusers (more than enough for a studio), yet she still attacks every day. This happens at random times, sometimes because of a loud noise from the upstairs neighbors, but usually with no noticeable pattern. She is becoming more aggressive with each attack, to the point where I cannot feel safe in my own home. Today she attacked me because the upstairs neighbor moved a table across the hardwood floor. After about 45 minutes of standing on my bed with a duvet to protect myself, I was able to run into the bathroom, but then I got trapped by her outside the door. Eventually I got her into the closet but this is getting way out of hand. I took her to the vet and she was so aggressive that they sent me back with a sedative and said to come back another day because they couldn't even touch her without being lunged at. When she isn't attacking she is fine, comes and sleeps on my chest and rubs on me, etc. I've never had a problem with her being aggressive before. Thank you so much for any help.