Because of the snakes size.

Yes, but it depends on the size of the snake

Just like eating anything else that isn't foot, it depends on the size of the ball and what it's made of. Three options: if you can digest it, you'll poop it out. If you can't digest it, but it's small, you'll poop it out. If it's not small and you can't digest it, it can stay in your stomach and you'll need to go to a doctor to have it removed.

that is how you spell digest.

Yes they do digest food.