Use different credit card on PayPal to submitted lots of orders within short period of time. Once the card works on your website, she start to place a lot of orders, if the payment reject, she will try another card or change the amount of purchase.

Open unauthorized chargeback after she has received everything. You are able to contact her by email at the beginning, but then she deleted her email so you cannot reach her anymore. Don't ship to this buyer, this is a scam and everything was planned.

Always make the buyers to pay via their paypal account, so you can minimize your loss.