Yea... it was pretty hard finding this out. Every time I googled "egg green" or "candling green eggs" etc, I would get websites explaining over cooked hard boiled eggs. Hahaha. But as soon as I started reading about B2 levels, googling "B2 Levels in eggs" finally got me some answers.
Hope your snake turns out fine. Like i said... this still may not be the reason as I am no scientist and the internet can be misleading. Update us in the future. It would be nice to know how it turns out. And future knowledge for any of us that may end up with a green egg.