I've never given my T a card because I don't know where it would end up (in my file? in her home?) and that makes me anxious. My T has never given me a card either, but this year she gave me a Christmas present and for the first time wrote on the tag. It says 'Hope you have a lovely Christmas, love, T'. I read it about 27 times a day!
That's weird that she sent a card the first year and didn't continue. Could you ask her?
I have 'pieces' of T strategically distributed throughout my life so I'm never without her. A keyring (sadly destroyed by my dog!) in my pencil case for work. Some pieces of paper she wrote on in my wallet. A box from her present on my living room shelf. A ball she gave me in my coat pocket. The ribbon and tag from her present attached to my teddy-mouse on my bed. The other week she told me she has a piece from my coat in her house that she keeps meaning to give back (she had to take me home once and the piece must have fallen off in the taxi). I was like "Oooooorrr, it could just stay in your house forever?" She said yes