I have seen some great suggestions and I agree that some thing to hang on the office wall would be great. You can also run a add in the local paper congratulating her on opening her new office and continuing her fine work and caring. This will serve 2 purposes 1. too say thanks and 2. to help bring clients in. I did that many, many years ago and it helped get a good vet off and running, I ran a1 time ¼ page add that vet now has 7 others on staff and will still make house calls.