Wow that is unfortunate! She's literally and figuratively scarred for life!    I used to dye my hair black for 8-9 years and have been growing my natural color out for the past year or two and have stopped. I've noticed grey hairs on me, and IMO people who let it grow out look better than people with 1 of salt-and-pepper roots on a dye job.     Then there are the chemicals...If it irritates most people's mucous membranes (watering eyes and burning nose), and the skin absorbs many chemicals, and hair dye is left on for extended periods of time...what is being absorbed and how will it affect someone in the long term.