Same Girl, Different Dreams

Well, this is not interpretation of a whole dream, is only one part that has been repeated for some dreams. There is a girl that appears in my dreams some nights. He has brown eyes, long black hair, about 22 years old. She doesn't speak anyway, he just stands there, looking at me, or doing things next to me.

Some examples:

Once I entered into an office and she was there, with her face maked up in white (just like a clown or something similar) He looked at me and opened a door without saying anything. She was staring at me the whole time, the she sat down.

In another dream I was next to the elevators of my building and she was there, waiting for one of them. She saw me and smile. I remember I talked to her, but she only smiled and that's all, later in the dream I discovered a friend of mine was teaching her maths.

In the last, I was going to drive my car. My friends were waiting for me into the car and when I was going to open the door, one of them go out and gave me a paper where there was a galaxy-map or something similar and told me "She says this is what you should had before, your link" (I think not was that exactly, but that's the idea, was something two of us must have) and then, I looked into the car and found her into it, sad, looking at the floor. She looked at my so sad and seriously that I get frozen, she looked at the floor again and... well, I'm not sure if I woke up or change dream but was the end of that.

I think I've seen more times, but that's the most important dreams as she is like the main character (and I haven't got my DJ next to me so I can't continue searching for her)

This could be under the dream signs category, but I think it could be more. I haven't met that girl never, it's not of my family, nor my girlfriend nor anyone I can remember. I'm not sure how to interprete dreas so, can you give me a little help?