Transmission Fluild replacement

What is your question?

My gf's 2003 Hyundai Tiburon has 110K miles on it. They car has never had any issues. We took it for a oil change at the dealership. They are suggesting to change the transmission fluid as well as the power steering fluid. Which to my mind is by the book. How ever my gf feels that transmission should not be touched as per her old mechanic. If there are no issues then not to touch it. It may lead to other issues at this point. Any advice, as to what we should do ?