N.R.
I had two friends drink a few Mountain Dew Code Red sodas. Don't know if that what did it for them, but it within 24 hours of drinking them they had their babies. It may be worth a try. I've heard caffeine slows labor though so who knows. The end is miserable, but she'll come when she's good and ready, you've made a nice cozy home she doesn't want to leave.