she obviously wants to annoy the pair of you and from your post it seems that she is succeeding. it also sounds like she may still have feelings for your partner or has the 'if i can't have him, you certainly can't' mindset. basically, you have to ignore her and the neighbour if she is colluding with the ex - and if you both really hate it that much, move out. you don't necessarily have to sell up but maybe rent instead until things blow over. btw - your post gives the impression that this bugs you more than your partner. you will also have to be careful not to tread on his toes or deliver ultimatums etc. that he may not be willing to hear. tread carefully, but you need to talk about this. good luck x