Only point out the positives. Even the smallest ones. You'll be surprised how much a non-athletic woman doesn't know. One time, my wife let go of her disc too early, it hit a tree, rolled behind her and around to end up 5 feet in front of the tee pad. So, I said "It's in the middle of the fairway, right in line to the target. That's the shortest way to get there." She said "Really? That's where it's supposed to go?" She learned something about what makes a shot good. Of course, at that point she had never seen anyone actually throw a disc that went toward a target, so how would she know?
Be patient. It was five years before she wanted to try a run-up, and another five before she wanted to try a forehand.
Remove any unpleasantness. Fish her disc out of the pond, bring it back out of the bushes. ("This is just practice anyway. When you are better it won't go in there, so you don't need to practice getting out.")
Don't assume she will ever want to compete. Competing is different than playing.
And yes, find a short, easy course with nobody around.
Start her off with "every hole is par 8" and lower it only when she can beat you (net, if you use par 3).
In general, its the same advice as being married: Do whatever she wants you to do, and let her do whatever she wants to do.