I think she probably stole it. Reminds me of this weekend when I saw a guy get stopped for stealing a pair of shoes at a store. He had put them in his backpack and when the security stopped him he said he was going to pay for them, he just was holding them in the bag.
And if she has a receipt for the dress its because she paid for it after she had taken it, no? Nice spin though on the part of her PR. Though isn't this the 3rd time she's done this?