Sounds like she was using a neti-pot. I thought most of the neti-pot products made it pretty clear that you're supposed to use previously boiled or distilled bottled water. Maybe they need to make it more clear that the consequences of using tap water can be pretty dangerous.
I know it has risks, but I still use normal tap water. From what I have read, all of the cases are from people using well water, never from city provided, chlorinated water. It actually says this in the article, too.