It is because she is either eagerly waiting for you to get in wants to get out or a potential door darter.
Cat sits outside door.
Door darting is a potentially dangerous behavior for a cat.
For the first time my cat sits outside my door and watch me sleep.
Polite cat sits outside his best friend s door every day waiting for playtime 3 1k views 7 months ago.
Even for a cat who is allowed access to the outside being able to just zip out the front door whenever it s opened can have very bad consequences.
A stray cat can find it difficult to find food warmth and optimal conditions for its development if this cat was abandoned or was born in the streets it could be that he is cold hungry thirsty or very frightened.
We have had our cat for like 3 months.
For a kitty who lives indoors exclusively escaping through the door to the outside can result in instant tragedy.
Either way there is a good chance it s one of these.
If a cat asks to enter your house or meows at the door it is very likely that it is looking for a safe refuge.
Lead image source.
How you deal with this varies more on this later.