There is the possibility that your grandmother is a hoarder or maybe not. Her ability to send you the box of VHS tapes tells me that she is able to part with items she thought you may enjoy. If she were a hoarder she would struggle with parting of items. If you send her a card twice a year, she gets the pleasure of hearing from you. If eventually she leaves or sends them to you, you have the choice of disposing of them as you wish or keeping them as you wish. Don't get so worked up about it.