Cat is hissing and swatting under the closet door?
So my kitty has been suspicious of this closet ever since we moved in a year and a half ago. Usually shes just pawing at the door and meowing, sometimes I open it for her and she goes to sit in there. Sometimes she begs me to sit in there too, then starts purring when we're both inside, super cute. Other times she just really wants the door open, for whatever reason. Not to go inside, just to know its open.
Today she's uh, hissing? Full force hissing under the door. She's not a hisser at all, ive only heard it twice when shes in real immediate pain (poor girl got her claw caught around our cat toy just as I went to yank it! I still feel bad months later), ive never heard an anger hiss. Instead, shes got this specific meow for anger, and another seperate meow to alert us to the presence of a mouse or bug.
So shes hissing under this door, staring something down, and swatting HARD under the door, like a little hunter. I open the door and look around, theres nothing in there? Not even a hole for a mouse to get in. And when I open it, she sits outside the door, all alertness gone, like nothing happened. Leave it open for a minute, she goes in, chills for a minute, comes back out, does whatever she normally does. I close it again? Immediately back in hunting mode.
I know yall dont know my kitty or my house, but i just cant figure this out so I figured id ask if yall have more ideas what I should do or check? Im at a loss and hate to see her so distressed.