Hair styles - Cerbral Palsy

Hello

I'm a carer and look after a number of children with a different disabilities. One of the girls has cerebral palsy and has limited use of her right hand. This makes being independent in some areas difficult. We brush and tie her hair before she goes to school. I was wondering whether there is anybody with similar difficulties. How do you tie your hair back without help? Just wondering whethe there is a way so I could show her?

thanks