The keyword in this case is Time.
Of course you can't force someone to stay against her own will, but the one thing she does owe you is the reason for her wish to end your relationship. Don't expect that you would immediatly be able to fix things up between you two if she does agree to talk with you. But still, give her some time, don't push her, maybe there's still a chance.
That's the first step, hearing what she has to say.
I'm expecting to read about any developments.