Leaving things in the past?

Hi,
I have been friends with this girl for the past couple of years, she wrote something in an email about me which wasn’t true. I spoke to her about it but she just didn’t appear to accept my point of view. She said she was angry with me and I was with her for writing it.
I just feel that everything was left up in the air. In order to resolve this conflict I would like to make the first step despite being the innocent party. I am afraid though that by me saying lets leave what was said in the past and move on as friends again would be seen by her as me being guilty. The reason why I want to make the first step is that I don’t think she will. It’s awful we have been friends for a couple of years.
Do you think that by saying lets move on, leave what has been said in the past and start again as friends is the right thing to do ? Despite what was said I am prepared to do this but I don’t know whether she will agree.