My absolute first guess would be parasites--it always is when there's an intestinal upset of any kind.
I cannot imagine an '09 so small that it barfs up a f/t mouse fuzzy because it's too big. I think some of the other people here missed what it was you feeding the snake.

Mouse fuzzies are what I offer to my runt hatchlings for their first couple of meals.

I would say something is very wrong with the snake. Its size suggests something has been wrong for quite a while. I would be very strict with quarantine on this one.