My wife did 6 cycles of Gemzar and Cisplatin after her surgery. 12 treatments in total. Her hair thinned a lot by the end of chemo but she didn’t lose all of it. She started wearing a wig after a while. In retrospect, she regrets it. A very short haircut would have been more comfortable.
Nausea is hard to predict. Some people get very nauseated right off the bat, others don’t. Keep in mind, she will receive anti-nausea medication before/after each treatment. It makes a huge difference.