I agree some hysterical over reaction on here. Any moment now mnhq will need to start handing out grips.
A lot of this stuff is normal for neighbours. Shopping in the same place? Kids the same age who are friends going to the same school?
However I do think as said this woman is lonely as a sahm, doesn't understand why the op no longer wishes to be her friend and.maybe lacks boundaries. Possibly she has self esteem issues and is not confident in her choices so sometimes copies the op. I'd assume she would be horrified if she knew fully how the op was feeling.
Some of the things mentioned I have done. For example my neighbour and I both use ocado. I'd be gobsmacked if she said I was copying her. However I did copy her, moved in, saw the van, though fuck me that's a good idea, and have used them ever since.
Occassionally someone will have something and I think God, that's gorgeous, I'd love one of them, but I don't because, well I wouldn't want that person to think I'm copying them, but I can see how if you're not confident in your choices you might do it.
I also have friends or acquaintances who have copied me. Something I've bought or done, but I see it as no more that liking the item or idea and fancying it themselves.
I get the ops is cumulative, but as said there is a lot in there that is normal, the issue really is lack of boundaries, lonely sahm, and her not understanding why the op doesn't want to be her friend anymore. I really don't think there is anything sinister, or worth going to the police over.