They have just brought out the new Mk4 model, go for that. It has dual voltage so she can use it anywhere in the world and it also has a timer that allows it to turn itself off if left on by accident. I have medium length hair and I have the narrower ones as well as the wide ones, although I use the narrower ones more. I would get her slightly wider ones if her hair is quite thick. Source(s): Http://www.GHD-retail.com
