I noticed one of my leghorn girls acting weird. She was all puffed up moving her tail like she was laying an egg except she wasn't sitting down, she was standing. And it was outside the coop. I got behind her and noticed a white thing hanging from her...Looks to be a rubbery shell...Is there anything special I need to do? Just pull it out slowly? We are going to catch her when she goes to bed to help her out some if she hasn't gotten it out yet. This is the first time this has happened. We usually mix a scoop or two of oyster shells in with their food btut I think we are also going to offer it separately so they can eat it as they need it.