I know my T would welcome an update from any of her past clients and myself if/when I decide to leave (never lol). She said that will make a T's day - is an update on someone they had worked with in the past. Not sure if that is true for all T's but just thought I would throw it out there.

I would start with letting her know that you aren't expecting a response if she doesn't feel inclined to give one but you wanted to let her know how things were going with you.