What would be the best way to approach my roommate about the damage in our room?

My dorm room is a suite with a number of bedrooms, a bathroom, a kitchen and a common room. Currently, two of my roommates have chairs in the common room. One of my roommates has caused an amount of damage to the wall behind her chair, from her bumping and scraping against the wall. I and my other roommates have sat in this chair and I have sat in it almost as much as the roommate who owns in it. Whenever I sit in the chair, I move it away from the wall and periodically check to make sure it’s not pressed up against the wall.

My question is this, how do I approach her about paying for the damage done to the wall? My school will charge the whole room for these damages but I think my roommate should pay the whole sum. How do I mention this to her without sounding as if I am attacking or accusing her?