Is this your bedroom?

Is this your bedroom?
Yes,it is!
It is very nice.
I have a new eraser.It is a fish.
Hey,your cat!
Is she in the living room?
No,she is not.
Is she in the study?
No,she is not.
Look!She is here!
She is in the kitchen.
这是一篇小故事,里面的那个第三人称“SHE”是只猫.但为什么会用这个女字旁的“她”呢?