@TreeGirl - what you say totally makes sense. She has shouted a few times in the past year. But nothing like she has been the last few days. She's also had some late nights and back yard parties recently (holidays, so I get it), so I've heard some phone comversations and the like while I am hanging out washing, or gardening, etc. I know there is something going on with her ex, and with work, so I get that she is probably not in the best space. I've considered popping my head over the fence before, but her partner keeps glaring at me from the back verandah. I am not sure why considering I don't think they would hear much from us. I swear I haven't poisoned their plants or anything.
This is partly why I wasn't sure whether I'm overreacting. She just seems much more angry than I would expect, and she can spew some vitriolic comments when she's worked up.