"She is the mother of fourteen children."
Translation:C'est la mère de quatorze enfants.
Il/elle becomes ce if it's followed by a possessive pronoun or an article. Same goes for people. "Elle est mon amie" would become "C'est mon amie". (And even though amie is feminine, mon is used because otherwise it'd be ma amie, and that's incorrect because of the a-a sound.)
I agree, how is this one elle, but most other cases you guys say "c'est"?
perhaps because there isn't an article after that. C'est is used when une, un, la, les etc are used.... but i'm not an authority on le francaise yet:)