2.STRAIGHT IN THE AIR & FLUFFED
When a cats tail is straight up in the air, and fluffed it means they are stating that they are getting angry. It is best to leave them alone, as they are giving you a warning sign through their tail. They erect their tails for you to notice and see that they do not like what you are doing.
1.BIG, ROUND, STRAIGHT IN THE AIR
This is similar to the one above when a cat is aggressive, however it is the opposite. When cats are playing around and happy, they display a similar stance. So it is okay if you are confused, but her demeanor and posture will tell the different. If they are relaxed, they are not about to attack you.