>In sentences where the indirect object is represented by "a + pronoun", and it is at the beginning of the sentence, for example  "a mí, a tí, a ella", it is necessary to repeat the indirect object by using the "short" pronoun (me, te, le, nos, os, les) in the same sentence.

I think this should be reworded. That "and it is at the beginning of the sentence" makes it seem like you don't need the shrot pronoun if you put the "a + pronoun" elsewhere in the sentence. I know one of the examples and the little tip box later clarify this, but I still think rewording that paragraph would help.