Snakes never actually completely stop growing. They merely slow way down after reaching a large size. Rapid weight gain and girth gain is more indicative of being gravid, than shedding is. You'll have no doubt a female is gravid when she gains 50-100 grams in 45 days. I always start weighing my females every few days, as soon as I see them mate or suspect they mated. The rapid weight gain will confirm it.