I agree with everyone else, your daughter should still send out thank you cards. There really isn't any way around that. Two years ago, my sister got married, I planned her bridal shower with my sister in law, plus we gave her gifts.......and to make it easier on her, I had bought thank you cards and had the guests fill out their addresses on the envelopes, made it like a game......just to help her out......I even offered to send them out for her if she wanted me to, but she said she would do it........well, let me just say I never saw a thank you card.......then at her wedding, my whole family stood up at her wedding, my husband was the best man.......and since she is my sister we gave them a very generous gift.......she never sent out a thank you for that either. She had the thank you cards for that too, all she had to do is sign them, I think. It bothers me a lot that she couldn't find time to write out thank yous at least for her wedding. She didn't send out thank yous to anyone.........
And to think, this is my sister.........I love her, but I do still think about it, and it still bothers me ALOT.
I understand you want to do something different for your daughter's graduation, but I don't think it should be to do something else instead of sending out thank yous.I am sorry, but there is no substitute for thank yous written by your daughter.