Find out something that she can't resist (personal, emotional, sexual, whatever). If she thinks that something is missing in you relationship I'm sure you can give it to her. You just need to know what it is.
I was ironic or rather I was trying to be. :(
But there is a simple rule what is quite universal. We people, generally became more easy when we really obtain something what's important to us.
There's love, passion but sometimes anger and pain. This is real life, this work more or less that way: only those who really love you are able to forgive you.