You are doing everything and saying everything appropriately. It is normal for your daughter to feel rejection, grief, sadness, and even anger. All you can continue to do is be honest with your daughter and do not offer false hopes of a reconciliation. Your daughter does not need to know specifics about why you divorced. She just needs to be reassured that the divorce was not her fault and that neither parent will disappear but will always be there for her in a very loving manner. Always allow your daughter to ask questions. But I think that you are probably at a point where there is not much more to say. If your daughter seems to be depressed or experiencing extreme emotional difficulties relating to the divorce, then you can always seek professional counseling to help her on a continuous basis. You can also seek counseling to acquire intervention strategies in dealing with the future questions that your daughter may have. She may have repressed feelings that may surface in her future years.
I am not sure if she has a step father and what that relationship is like. That may be an issue as well.
If this has helped, please ACCEPT. If you need more assistance, just ask. Thank you and HAPPY NEW YEAR!!!