I work to wear out our 3 month old girl between dinner and bedtime.
She has no more than three or four hours a time in the crate during the day with a walk at 10:30, backyard time after lunch at 1, and then supervised play at 3:30. We do a long walk, throw the ball around, chase in the backyard with the kids, wrestle, etc. after dinner at 6 in advance of the kids going to bed. Once the kids are in bed, about 2 hours before our bed time, no games. She is usually exhausted by this point and just wants to sleep at our feet. If not, she gets quiet time in her downstairs crate while we read or watch tv. She goes to bed in her crate in our room when we do.
Once the kids are in bed she seems to know that it is time to chill. We have just tried to do what we did with our kids which is to try and stay on a consistent schedule, so perhaps she knows that we want her to calm down when the kids are done for the day.
I will say that we have had some more difficult nights, and those have usually been when she has had less stimulation or excersise. A good game of throwing the ball, and/or a session chewing on a bully or marrow bone have helped her chill.
Good luck!