She seems so young for this, however, I am not sure. Has she been laying at all. Did you check her crop? Could what you feel be egg bound? I hear yah that its odd shaped. Try the human calcium anyway to see if she might pass an egg. I would deworm her anyways and dust her. How does her poop look? Rule out things. There is a lady who I believe has experience with this, @Speckledhen I am hoping it nothing to serious.
https://www.backyardchickens.com/u/348/speckledhen
https://www.backyardchickens.com/u/348/speckledhen
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