As a girl I'd say that she should be happy with any GHD hair straightener and you can't really go wrong with them. They're all quite high quality as far as I know. If you're feeling a bit unsure (I think you do), the best and safest choice would be one of these 1 2 3 depending on your budget. But if she has super long and/or thick hair, this one might be good as the plates are bigger or if her hair is really short, I'd probably choose this.