Been there. You have to realize that you are a loss for your ex and she needs to go through the five stages of grief (denial, anger, bargaining, depression and acceptance). Google the "five stages of grief" and find a website that talks about it in relation to relationships. I think understanding this will help you deal with your ex and understand what she's going through.
Basically, everyone takes a different amount of time to go through this process. You probably recognize some of these stages in your ex's behavior.
Whatever you do, don't get back together then break up again. Otherwise, your ex will be right back at stage one. Don't give her hope that you might get back together. It is difficult, but eventually she's get through the loss and move on. It could take another year though.
Good luck