Answer:
Poker chip tool.
Faces pain rating scale.
Step-by-step explanation:
Considering the mental ability of the age of 8, both faces pain and poker chip can be used in order to determine in how much pain the girl is. Faces scale -- for the children of age of three. There are, for example, five faces shown and five different colors. For example from green to red ( green shows minimal pain while red shows maximum pain ). The child would pick the face and color and the doctor would know the strength of pain. Then, we have a poker chip tool. It's very successful in determining the pain level for the children of age of four and older. There are a few poker chips in a row, and the child picks one that is similar to the pain they feel. This might also work on this girl considering her condition and mental ability.