Every client is different. You know this client better than I do, and you haven’t said much in your post, so I can’t give you a specific answer. Here are some things that have helped me with new clients.
1) Use their name at least 3 times during session. “You’re doing a good job, Nancy,” rather than just, “Good job.”
2) If they are not doing what you ask them to do, try to find out why they are resisting. Is the move too complicated? Are they injured? Can you change your wording? Once you know why they are resisting you, you can address the issue.
3) Encourage your client to set realistic and attainable goals. Tie the movement that you’re asking them to do to their goals. For example, one of my clients started out with me because she got stuck in a kayak and couldn’t get out. Every exercise we did, I related to how it would make her stronger for her next trip, something that was meaningful to her. “This exercise will help you paddle once you get into the kayak. This exercise will help you get out of the kayak. This exercise will give you the endurance to carry your kayak from the trailer to the water and back.”