How do you handle annoying people?

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It's been a long time since I last posted a discussion here. Now, I would just like to share what I am feeling right now. So, our office is kinda small. Each employee has their own designated computer placed on adjacent tables; so we can literally see each other. The restroom is just in front of all of us. The door is literally facing our direction, as well. So here's the thing. I have one co-worker, the oldest of us, she's in her early 30's. Every time she's done using the restroom, she always leaves the door open. It really annoys me because that's not how we are at home. At first I was holding back since she was in this company first, it's just my 4 month. I came to the point that I really can't take it anymore and it really bothers me so I told her to keep the door close, because that's how it should be since we are in an air-conditioned room, plus we also eat in our tables since there is no separate area for eating. I told her not only once, but more than 4 times. I got tired of repeatedly saying it so I stopped and she went back to keeping it open. I just really want to express this coz it's really is annoying. Like, she's just 7 years older than me. She should have noticed that everyone except her keep the restroom door closed.