Praise be to Allaah.
If this is the case, then it is permissible to cut her hair because this will protect her from harm. (Fataawa al-Lajnah al-Daa’imah, 5/182), on the condition that she should not make herself look like men or kaafir women. See Question #1192. And Allaah knows best.
Sheikh Muhammed Salih Al-Munajjid