have you sent a message direct to her email address?

what would you suggest to do if the buyer had won my item on 07/07/10, i have sent her 2 invoices (one on 07/07/10, another on sunday) and also sent a message to her (requesting to pay as soon as she could or if she couldnt to do so just let me know what her plans were) today in the morning. have had no response from her whatsoever? she has 0 feedback and had been registered user for only two weeks. im sure she knows what she is doing tho, cause i had another person bidding on my other item, she was newly registered user, but whatever questions or concerns she had regarding paymet/shipment, etc. she actually communicated with me requesting clarification or help. i addressed most of the questions here, on the help board if i didnt know straight answers. anyway, the bidder that i have a question about does not seem to be willing to respond to anything i send to her. as she's based in estonia im thinking of sending her a message in russian language, or something?