My opinion is that whatever you decide to do with the gift cards is completely okay.
If you are going feel guilty if you don't give her the gift cards then give her the gift cards even it is awkward assuming you ever see her again and happen to have the gift cards in your wallet.
If you want to keep the gift cards whether to avoid an awkward situation, because you want to use them yourself, or because it was a gift to you that's fine to.
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