A woman with a knife...not a good combination

A while back a woman left us her baby that had been concieved through rape. The woman is 16 now and decided to visit our home with a knife. I do not think she meant harm, but she would not hand over the knife that was hidden in her waistband. None of the children were nearby and our security guard held her down and another person took the knife. The woman then got hysterical. It was not a bad as it sounds, but it was a little scary.