You are giving her too much freedom and not supervising her if she is going when you are out of the room. At this age, you should give her 100% of your attention when she is out of her pen. If you can't watch her, she needs to be confined.
Supervising her 100% is a lot of work, but will be worth it in the long run. Every time she potties in the wrong place, it just makes it more likely she'll have another accident as she really won't understand where she is supposed to go. If you are with her, you can praise and treat her when she potties where she is supposed to. With positive reinforcement, she'll figure out what you want her to do. |