[MattJack]

Are you assigned that parking space through your apt complex? Assuming you are in an apt.

If so then just knock on her door and politely say, "Hey I noticed you've been parking on what I think is my assigned parking space. Maybe I'm mistaken, but I just wanted to clear up any confusion."

Throw in some smiles, a wink, compliment her outfit, and hell, maybe even a little grab ass. Women <3 that shi*.

Problem solved.

If you don't have an assigned parking space then join a gang and use force/intimidation.