Okie dokie everyone. Thanks for (some of) the replies! It's a disgrace that people would consider poisoning an animal, but this is the Internet I suppose.
Yes I agree it was presumptuous of us to suggest she close her window...BUT it needed to be said and we did say it nicely, and it's all very well that she has rights etc etc, but I mean...now we are in the position of, after two years happy in our home, having three cats indoors, one of which is now turned vicious (and we have a 1 year old baby in the house) and has started leaving number two's everywhere due to stress. We have had to put her up for adoption as it just doesn't feel fair to her. We politely told the lady this stress and fighting was what we faced, and lo and behold it has happened. And remember her response was "Well I shouldn't HAVE to close my window a few inches!" Like talking to a brick wall. Now, a few days after the dispute, her ex husband is loudly threatening to kick my partner's head in when he is outside the house when he comes to visit the daughter.
And FYI, cat proofing only works when done properly, which I was quoted £500 for. Not affordable for us. Also, this neighbourhood is so full of cats you can't walk down the street without seeing at least one or two. There's been six in our garden since we stopped letting ours out (that I have seen).
We are upset that she wouldn't listen to our side of the situation, but only cared about what she should/shouldn't have to do. Our other neighbour seems to be joining in on b***g sessions, along with every visiting friend and family member, despite the fact we all apologised and agreed no bad feelings after a fairly heartfelt chat.
This is such a ridiculous situation, but we have played nicely and done what is right according to her.
I don't dare tell her how much her refusing to close her window slightly has affected us but now we feel unwelcome in our street with all the neighbour's having a right gossip and the threatening ex-husband. Never mind our wee cat who is being rehome with a stranger! I'm terrified he will kick our pets or poison them. It's only been a few days but I've had the cats escape several times and had to chase them for ages. We quite honestly don't want to live here any more as there is a lot of bad feeling. We are moving house as soon as we can afford.
And there are people here who think we should have just apologised and kept our cats confined without trying to explain our situation or offer alternatives?!
Here's the ironic thing: now our friendly cats aren't defending their territory, the feral ginger who ruined our three piece suite has moved back in and has promptly sprayed everywhere, including this woman's door mat. I assume he has gotten into her house too, as it has been blazing hot for the last few days and her windows are firmly shut, and windows and doors are lined with bottles of water (supposedly these ward off cats!?). Anyway, it can't be meant for our cats as she was informed we were keeping them in and now every time I see the ginger tom, I smile and pray he'll spray her leg. Karma at its best! I personally would much rather deal with closing a window to keep a friendly cat out than dealing with a feral, urinating Tom cat.