In my experience, post this Christmas was dire. I didn't get two cards from people I expected to get cards from and a very old friend of mine phoned me in the new year to check that I was okay as she had had no card from me. I had put quite a long letter in it which fortunately I had typed on the computer so I printed it out again, put it in another card and sent it to her around jan 10th. That card and the original Christmas card arrived on the same day. I agree with bedknobs, if your grandchild had sent a card, she would have assumed that you received it. I can see why you are upset....no I wouldn't say you are being unreasonable exactly but unless she is in the habit of not thanking you then I would give her the benefit of the doubt.