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often times birds lay a few soft shelled ones first of the year, especially if it's the first eggs she's ever laid. However if it continues, yes you will need to put some calcium in there for her, oyster shell is the most commonly used. However if you are using a good feed, it should have all the calcium in it that they will need, check your bag and look for the calcium levels in the feed, a good layer feed should have plenty, if yours doesnt switch, or add oyster shell