My SIL has twins, so I can't speak of my own direct experience. One of my colleagues has 15 y/o triplets.

Both my SIL and my work colleague have said that their membership to the Multiple Births Association is by far the most valuable support they received before and after the births of their bubs. I know my SIL still gets support from her multiples mothers group. Perhaps you could put your friend in touch with her local MBA, or buy her a membership (I don't know what, if any, their fees are).

Um....other than that, my DH and I steered clear of buying too much "stuff" for my SIL because she had so much given to her already. Instead, we gave her and her DH gift vouchers for Myer or Target, to try and allow them to buy what they needed that might not have already been given to them.

GL to her and her family.