While I understand the difficulty in dealing with this situation–
How old was the older lady? Perhaps she suffers from some sort of dementia. (Alzheimer’s Disease is the most common form, but not the only one.)
In some cases, the dementia can manifest itself in cruel or aggressive behavior.
Many times, such behavior was not shown by the individuals before they became ill.
Any number of people who have been around patients suffering from dementia knows exactly what I am posting about. We need to remember that such behavior is not the people’s fault. They are not responsible for their actions. while those actions can be difficult to tolerate, we must do so as a caring society (and especially as a society of Torah Jews.