We live in North Texas. Aquired a pair of swans 3 years ago and they live on our 4 acre pond. The male disappeared after only two weeks of arrival leaving the female a widow. She has been by herself since. Except for a pair of ducks she hangs with, she has been friendly for the last 3 years and we occasionally feed her by hand. Two months ago a little boy rushed at her and she tried to attack him and I had to get between them. She is super friendly to me but since the episode with the little boy, she has been going after guests. Is there any way to curb this behavior and make her stop attacking people?