Firstly I suggest placing all this into perspective, when you say your child is hurting herself...she may just consider this normal, so for her to understand that this may hurt she needs to experience complete and utter pain.

Firstly i suggest nailing her to a ceiling fan.
Secondly I suggest turning the ceiling fan on at full speed.
Thirdly, on every revolution of the fan i suggest striking your child with a large piece of wood.

This method will soon stop your child from hurting herself deliberatly.