Zoo,
I think that is a great idea for you to acknowlege your 2 year anniversary with t. Not only to show your love and appreciation for her but also to celebrate your hard work and determination. I think that all therapy is a dance of reciprocity when it comes to t and client. This has not been easy for you by any means. Make sure you celebrate yourself in this moment. Try not to worry about your time in the future with t or the bumpy road you have traveled in the past but stay in the present moment if just for the day and give yourself and your t a well deserved moment of admiring the intricate details of your t proccess. As for how to let your t know how you feel, only you know your t and what would mean a lot to her. I know personally I have given my t numerous gifts and the one's that meant the most to him were either something I had made or a card with heartfelt words. I know you will figure out something super-duper special and your t will love it.