I don't know what you mean by "emotional", but don't go acting all desperate. She needs to see you as strong, or she will lose respect for you.
I disagree with the idea of encouraging her to see him. I don't care for game-playing, and acting like you don't care will send the message that YOU DON'T CARE. Personally, I think it is much better to go straight to the point. Tell her you care about her. Does she care about you? Does she want to be exclusive with you? If so, she needs to walk away from her past. Yes, she may say that she is unwilling to stop contact with her ex, but this means you never really had a chance, anyway. You can't invest yourself in a new relationship when you are all caught up in an old one.