An Chearc is a hUibheacha

Itheann an chearc a huibheacha má tugadh thugtar di le blaosc ó uibheacha iad.

<em>Cearc</em> is feminine, so after the article it takes <em>séimhiú</em> (<em>an chearc</em>).

The second part of your sentence means "if [...] was given to her with a shell from eggs", I'm not sure if this is what you meant to say. I changed the tense to match the first part of the sentence and I added an object: "if they are given to her with an egg shell"