One of the best strategies is to let the relationship cool off for a while. Just let some time go by so she does not feel all this pressure. Remember she has made a decision and she is fighting with herself wondering if it was right.
After it cools down and you have given some real breathing room to her, write another letter in which you tell her that even though you understand her feelings it would be tragic if you were never able to show her that you can be trusted. Ask her to have dinner - as friends- so you can talk further.
Some times subtly opening the door can be the thing that brings two people back together. Once the door is open you have a real shot at reuniting.
The trick is the cooling off period.
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