I can't tell from the pics, but do you mean her breastbone, or keel? If that's the case, she probably has worms. Give them all a bit if wazine wormer if you have it, put some ACV in their water, and mix some food-grade DE in their feed.
Yes, i agree i think it's worms. LIke the one above me said, if you SEE worms that's when they are so loaded its almost the end of the road. I'd worm her. ALso, i dont really see what you're talking about