with no contract it actually aids you in the matter. rare occurance i know but it does. without a contract there is nothing stating what EITHER of you are obligated to do. You knew it was going to be for free and she assumed she could intimidate you into doing whatever her cheap britches asked for.
You are not required to do anything other then what you want to. She can't take you to court, and win at least. She has no say in whether you display the images or not. if you decided to give her 1 photo from the entire shoot she has to deal with it. contracts are to protect you as the photographer for liability, copyright, and payment. ironically the lack of contract means that nothing is ever promised.
Try suing the landlord of your place regarding something that was verbally promised but never put in writing. its up to the judge who will inevitabley be frustrated that your even standing in his/her court room over something so mundain as her wanting something that you are not remotely obligated to provide.