I too would suggest she try a nipple shield, I used them (for a different reason though) I couldn't get the Medala ones where I live I found the Pidgeon ones to be good.

I also think your suggestion of a Chiropractor is great, my second son had a bit of a rough birth and his neck and shoulder were out, I know where we are in victoria there is a chain called Kiro Kids but I'm sure there are other ones around that specialise in children.