"If your reservation has not gone through and yet your credit card has been charged, then it could be a soft charge.
A soft charge is a temporary authorization that will automatically drop off your account within seven days, if not sooner. A soft charge is when Orbitz ask for funds from a credit card / debit card company but does not actually charge the card. By doing this the funds are taken out of the available credit on the card but not included in the balance that you need to pay to your credit card / debit card company."
Okay! But then that does not explain why they should charge twice for the same ticket. And then they write
"We value you as a customer and look forward to serving you again in the future."
Yeah right! Now that you know she has enough money to buy another ticket, she is of course a valuable customer! :).
I hope this thing stops in the future.