One of the most important thing is to try to get her on the phone now and then, in this way you can confirm your and her letters to each other.
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Only use real, professional and verifiable agencies.
To be very serious in your intentions and to be very open to her, gives you a response which you can analyze as reliable or not.
Ask specific questions and check if you receive answers on these questions In case you are using an Agency with email forwarding or other mail-services, and your correspondent is not responding on your specific personal questions, this could be a sign of being suspicious.
Another important thing is to confirm with her if your (original) letters indeed are reaching her.
Better be sure than sorry, so don't leave right now, we are not finished yet.
And if you are satisfied with our contents, please spread the word, I always feel sad if I receive emails starting with 'I wished I had found your website sooner...' Here are some tips to start with, these tips are an extract of parts of the subjects described in this topic.
Try to send copies of your original letters using postal mail or a fax machine at her office (if possible) and ask her if these letters are the same she received through the Dating Agency you are using.