This girl keeps pushing her body against me?

This girl from school will stand so close to me all the time she pushes her body against me. I kept moving away a little bit when she would do it but then she would close back in so I've just started letting her do it.

I'm confused if this is some kind of flirting or she just has a habit of standing so close to people her body is touching theres. I talk to her but just like a friend and she doesn't flirt with me. I also think she has a boyfriend.

I don't know if I should keep thinking this is weird or take it as normal.