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Hi this is Dr. Hill. So, she has not started laying eggs yet? Is she laying in a nest box? What type of hen and what is her normal diet. Does she free range or stay in an enclosure? Was she vaccinated for Marek's disease as a day old chick? Lets start there.
I am so sorry. Definitely find out if she was vaccinated. I feel that it is important to find out what caused her death, so I recommend that you refrigerate her body tonight and take her in to your local veterinarian so that her body can be sent for a necropsy. This way you will know if the rest of your flock is at risk. Is the rest of the flock around the same age, or are there no additions to your existing flock?
It is hard to watch them pass. It sounds like she was very weak. Were there any other signs of abnormal behavior over the last couple of days?
Typically if there is an egg stuck you can feel it by feeling the abdomen just above the cloaca or by inserting your finger into the cloaca. It is pretty unusual for such a young hen to be egg bound unless the nutrition is grossly deficient. The Marek's vaccine is given at one day of age and I don't think it could be given now. Having the deceased hen checked will let you know if you will have issues with the other ones. Many feed stores won't carry vaccinated chicks because the general population is very anti vaccine.
You are very welcome. I have nine hens (girls) that I adore. If you are satisfied with my answers, then please take time to rate my response. You can continue to post on this thread even after rating. Again, I am sorry about your hen. Take care.