DO NOT tell her she will be useless because of the pregnancy; that she will
never be the same again; that she has been dishonest when the pregnancy was
suspected; and, that she has sought a promotion and pay rise on false grounds
becuase of the pregnancy.

Such behaviour has just cost one boss nearly £60000 in compensation, £37,100 of that being awarded for injury to feelings.

I think that makes the point nicely
without me having to say more!!