@bobsal u1553115,
I think what both you, bobsal and you truesigma are just being sensitive to one person's pain. Both of these individuals (if this older woman truly has mental health issues) have issues and we should care for both.
In your example bobsal you only mention the elderly woman with a broken leg, what if she has a broken leg but yet had a gun and shot the other woman. Both people should get medical help
In this example, assuming both have mental issues is you help both. One does not get priority over the other. This older woman does not get a buy and is allowed to shoot someone simply because she has a hurt leg, neither does she get a buy to be allowed to abuse someone else simply because she has a mental health issue.
How you handle the older woman though would be different if she has a mental health issue vs not. BUT you still stop the abuse she is causing.