I hope that the people who bought his property will put up a chicken coop or a higher fence to contain the chickens. It's wrong to let them roam outside of the yard.
That's not a nice thing to say. Maybe she works and hasn't had time to answer. Be more thoughtful to what you say or don't say anything at all. She is asking for suggestions not smart aleck remarks.
I think some of the suggestions are good but having to put up a taller fence shouldn't be your responsibility. I would think trying to get a hold of animal control (if you have one in your area) and tell them about the chicken nuisance you are having and see what they suggest for you to do since...