I sometimes use clear gallon plastic bottles filled with water, placed around the lawn to keep racoons off my lawn. It does work. Otherwise at this time of year I have droppings all over. One year I picked up fifty-two piles left over a two week period. I set out the bottles when I cleaned it all up and it completely stopped their defecating on my lawn. The problem stems from a few neighbors with old ramshackled sheds that harbour multiple families of the varmints.
She may be trying to keep spirits away though. Does she have a mirror on her front door?