When you buy or trade her on the board people you trade or buy from can leave a feedback score for you. It's at your profile section. For example, I was involved with the doll quilt swap and my partner and I left a feedback score for each other. You can view these in my profile section if you want to see the examples of what people say. It gives you a good reputation when you complete your obligations in a timely fashion.
But, there are a lot of people who do leave feedback scores and there are a lot of people who don't.