She sounds like a coward if she just broke up with you via email. In my experience that means she'll have other plans or have an eye on someone already.
Don't rise to it, go out and pretend you're having a good time and just wait. DON'T let her know you miss her even if you do. So long as she thinks you want her back she'll feel secure and do what she likes knowing she can go back. As soon as she loses that she will panic. She'll just think WTF he's over me already and try to get you back or make contact again to try to confirm if you still like her. Tell her "Sure, come down for the weekend!" and let her drive 3 hours to your house. Then when she arrives tell her you've changed your mind so she may as well drive home again and shut the door on her leaving her to drive 3 hours back again. Worked for me with a cheating ex who moved in with the other guy and tried to get back with me whilst still living with him!! I'm sure she enjoyed 6 hours of M25 rush hour, road works traffic really.
Failing that, do what I did the second time and move half way round the world! Haven't regretted it so far!