Well, it's getting a little late in the season but I would still try for a month or two. Are you keeping them together or separately? If together, they might be mating when you aren't looking. If apart, I would put them together once a week, say every Sunday evening, for about an hour. If they don't breed, she isn't ready and can go back to her home for a week.
I would put them in a pretty bare bin, with a lid of course, with either newspaper or nothing on the floor, so you can see "evidence" of mating. Before putting them in I would lightly mist the breeding bin. I would put the female's shed skin in the bin, and lightly mist that. The pheromones from the shed can encourage the male to try harder. I would put them together in the evening, especially if it is raining outside.