I had a hen do this as well. I'd give the calcium supplement and keep a eye on her. My hen started to bleed after these types of eggs. I ended up loosing her to internal bleeding. Make sure she's not giving off a infection smell. If she is start her on antibiotics asap. Otherwise I would give the calcium and watch her carefully. My hens case is likely a extreme. Hopefully the calcium will do the trick. Keep us posted. How old is she?