I think it may have to do with someone banging on the walls which sounds like what children would do, and which would make the older woman be unhappy to see them next to her residence. But we’ll only know if the news media bothers to go past the first report.
I only played on other people’s property if their children were playing with me.
Maybe other children were playing with them. The yard isn’t the woman’s property. She overreacted to the children.