My hen mallard is 20 months old. She started laying eggs in the winter of 2013 and has pretty much laid an egg a day since starting. Every couple weeks, she'd lay a soft shelled egg which was no big deal because the next day it would be a good one. When she ran out of layer food, I went to the local supply store and bought some Nutrena Feather Fixer pellets. She has very bad feathers and has never molted so I was hoping she would molt soon and this food would either help grow her new feathers or fix her current ones (she still hasn't molted, no clue why). So we started giving her that and I'm pretty sure (as I remember) this is when the soft shelled eggs started happening daily. She has laid soft eggs for probably 2 weeks in a row with the exception of 1 good egg I think. A few days ago, she laid one that almost had no shell, she just pooped out a yolk, the white, and a tiny flappy "shell" that all just plopped onto the ground. She eats oyster shells every day, corn, lettuce and peas, meal worms and her food. I have been giving her some calcium water for a few days but nothing yet. I also added some raw apple cider vinegar to her water tonight hoping it would help. Now I have been giving her the remaining layer feed as her food. Does anyone have any ideas on how to get her back to good eggs? She struggles so much laying the soft eggs. When I'm with her and she going to lay one, she drinks tons of water then she relies on pushing against my hands to get the egg out, and it is clearly painful and hard for her. She immediately loses all her energy and sleeps. I feel terrible she's going through this and really need some help for her. I can provide a picture of one of the eggs if any one wants to see what I mean. Thanks!!!!