DD had plagiocephaly, and it was deemed to be 'moderate: requiring attention' because it was starting to involve her ears and face (one ear was more forward than the other and her forehead was bulging one on side because the skull was becoming so out of shape from the flat spot). She also had torticolis, a neck muscle issue, so a lot of physio was required but because we started treatment at around 4-5 months of age she didn't need a helmet.

On one hand, you don't want to offend or cause her to worry, but untreated plagiocephaly can become an issue (mostly cosmetic) if it is moderate to severe - can impact on the position of the ears, eyes and also jaw alignment which is the major cause of issues later on. If you are still in contact with your MCHN, can you get some info and then casually pass it on to your friend next time you see her?

You could also send or print her this. http://www.rch.org.au/kidsinfo/facts...fm?doc_id=7666