Thin egg shells

I have 2 hens and one of them (a Califonia White) is laying extremely thin shelled eggs.  In fact for 4 days in a row I've found her eggs broken and possibly eaten.  

 

Several weeks ago I found an eaten egg so I put a plastic egg in one of the nesting boxes and didn't have any problem till now. 

 

My Ameracauna went through a typical molt this winter and now is laying eggs with good strong shells.  Does not molting produce thin shelled eggs? 

 

My Califonia White never did go into a molt and kept laying everyday but she is looking very scrawny now....Any ideas??? Thanks.

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Replies

    • Just checked the bag and it's Purina Layena natural
    • She is about 1 1/2 yrs old and getting Purina organic layer crumbles.
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