I wouldn't panic quite yet. I've had one particular snake escape 2 times. She was a baby around the same weight as yours. She went missing for a week once. And 2-3 months for another. She turned up on her own both times. She was fine when found. A little thin, but not drastically unhealthy yet.
Good luck with your baby.
Try making a trap and fix it to a wall or something. Put some feeder bedding in it. Or even a FT. Covering part of it will make it seem like a secure hidey spot for the snake too.
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