I've always given my long term Ts a small gift and card every year.

Keep in mind that you cannot set another person's boundary for them. You can only set your own, so unless your T told you otherwise, your act of giving the gift wouldn't cross her boundary. Her boundary would be receiving or accepting the gift or related actions. People, including Ts, often seem to be confused about this, so what I'm trying to say is giving the gift is your boundary and decision, not hers.

Personally though I realize people may have their reasons, I think that the concept of Ts not accepting (small/inexpensive) gifts is rather wacko.

Cookies/chocolates and a card sounds like a thoughtful gift. I would just wary of any dietary restrictions or preferences (ie allergies, vegan, sugar, gluten).