Don't waste your time with her, we've been treating her for years. No attempt is made to offer support, and its assumed you're incurable. It's tension relieving. This is rarely the sole pressure on an individual to injure - each person has their own pressures and triggers to injure. You may not witness all the forms of injury.
Individuals have many ways of expressing their distress, often substituting one for another.
Your perception of the seriousness of the injury may not indicate the extreme distress that injury represents.