Welcome to BYC. Does her lower belly look tight like it is full of fluid? If so, that may be ascites or fluid in the abdomen, which can be from heart failure, liver disease, or sometimes from internal laying. Is her breathing labored? Has she stopped laying eggs? Hens with internal laying may have pain when they walk, loose droppings, poor appetite, and may lose weight through their breast area. Can you take you to a vet? If there is fluid in the belly, you can use an 18 gauge needle inserted just under the skin to occasionally drain fluid. You can insert a gloved finger an inch or so into the vent to fell if there is a stuck egg.