She doesn't look like she is pregnant at all. She has "fat rolls" but I highly doubt she is on the extreme obesity side. I think she is fine in that aspect, but she does not look pregnant at all.

Just because a ball python is on the cool side, is absolutely no indication that she is building. All snakes travel from the warm to cool side on their personal wants and needs. 68F is definitely too cold but it doesn't mean that she does not need to cool down from time to time.