I would repeat the calcium once a day in case she is straining to lay an egg. There could be lash egg material stuck or constipation, hard to know. Encourage drinking fluids. Mixing water with a small bowl of chicken feed would be good.
Have you inserted a clean finger into her vent to check for a stuck egg? She either is egg bound, or more likely is suffering from a reproductive disorder, such as egg yolk peritonitis, salpingitis, or ascites (water belly.) Since she has been like this for a week, it is probably not egg...