Exactly, Meg
My experience with brumation is that most of the snakes come out of it looking fatter than they did going in. Whatever is going on with their metabolisms during the brumation period is beneficial to them.
Several times I've cooled a hatchling off during the winter (for several weeks) due to its going off feed or regurging. Its always seemed to help.
This particular snake never fed, so about 2 weeks or so after its birth, I shut down the heat.
It brumated fine. It was healthy but thin when I 'woke it up'. It didn't feed for awhile, so I force-fed it a mouse tail several times.
When it finally did eat a pinky, it threw up about an hour later, became very lethargic, and on the day I planned on trying again (about 8 days later), it was dead.
In hindsight, I should have awakened it earlier, but, ...