Keep your coop where it is. Make the fence high enough on that side so she can not see over it. Her husbands health issues are not your concern. She is looking for a scapegoat and someone to blame. The mere fact that she is trying to rally the neighbors against you says she has some more serious problems. Unfortunately, people like this just keep after you if you allow it. If anything, document all her contacts with you. Record her (audio) with a cell phone in your pocket upside down, all conversations. You will soon have enough for a harassment lawsuit and can probably do it for little or nothing in a small claims court. Easy enough to have her served with a restraining order and no trespass. Not sure where you are but it can be done here.