Starting from scratch, I do not know how long the follicle building process takes, but from the time i see obvious signs like belly bulge and weird body positions, it did not take more than a month before the ovy. Then again, not all builds end in ovulations. Good luck to you. Let us know if you are successful.
By the way, i catch even young snakes lying on their side, and even males. But since you are pairing your snakes, it can be signs of building. Does she eat still? I noticed that a good indicator of success is increasing girth even without meals.