It's a nice dress, but I'm not sure if it's the best thing for a girl with big boobs. I'd want something that shows them off better. So maybe a deeper neckline or something. Also, the folds in the front will kind of hide her boobs, which is less than ideal.
eh I think this is more of dress for flatter chested girls. I feel like that type of halter cute is awkward on big boobs. I know it totally sucks though, I hate when I see a cute shirt and realize it won't look as cute on me as it would on a skinny flat chested girl.
Girl to really be able to say, I'll need to see it on you. You can be surprised at how different clothes can look on people, there could be other details that really determine why the dress will be good on one person and not on another.