i agree, eggs are soft and conform to the snakes shape not the other way around. she may have an obstruction or a very large bowel movement in her.
i haven't had a snake look that lumpy with a bowel movement either, just tossing ideas out there. i would keep an eye on her and make sure she is very hydrated.
feel the lump and see if its hard or soft. it may give you a better idea on what it is.
good luck with it
adam jeffery