I have an idea:

Make her a gift she can hang in the office - whether it's a posterboard covered with cat footprints (non-toxic paint, of course) and says "We love Dr. SoandSo!" and some human-drawn hearts, or a collage of cat pictures of kitties she has treated with that message nicely printed in the middle - something she can hang in her new place, to let new people know she's got lots of happy clients who love her already.