Is it wrong to buy goods with the intent to return them?

A friend of mine will often buy jewelry from large department stores for events, knowing that she'll likely return the items. (Sometimes, however, she'll keep an item even when she thought she'd return it.) She returns the goods undamaged and soon after buying. She asked me what I thought of the morality of her actions. In my opinion, she's acting morally because she's not committing fraud. The stores in question have liberal return policies ("if you are unhappy for whatever reason..."). They must know that some of their customers might do what she's doing and think that allowing it is good for business. Is that right?