Females can lay slugs (unfertilized eggs) too. I'm thinking that's what the "yellow rocks" were!
Also, you said you force feed.
Eek.
Please elaborate. How often, of what, and WHY?
These snakes can go months - MONTHS - without eating. I know she's not in the best state, with having all those health concerns, but.... ahhhhhh. Force feeding is considered a very last resort from what I've seen, and more often used for hatchlings who won't start eating, if I'm not mistaken.