I really feel for you OP as we're going through a similar thing.
We own. She rents. It's been four years of absolute hell. Constant smell of cannabis, she's verbally abused me, she's spat at me, her son is feral, violent fights between her and men, she can't talk - everything is shouted, loud music, throws her household waste directly into her garden, videos us in our garden. It's been absolutely horrendous.
The Police have been absolutely useless - because every time they go out to her she spins them a load of lies about us (me in particular). The annoying thing is they never ask me about these lies so I don't get chance to put them right. The local authority can't even be bothered to respond to me. Her landlord isn't interested. I've got a log about 16 pages long of antisocial behaviour incidents but they just fob it off as a "neighbour dispute". There is no "neighbour dispute" - this is a sustained course of anti social behaviour by one person, who is known to the Police and the local authority and was thrown out of her last house for poor behaviour.
Last weekend she actually posted a horrendous fabricated disgusting statement on Facebook about me and my husband. And another post containing horrendous lies. She's made numerous untrue allegations about me - even alleging I went into her son's school about her. I've had to contact the school direct for them to prove this is untrue. She's a very dangerous and unstable individual. The Police won't do a thing. This almost tipped me over the edge. I'm currently trying to get an appointment to discuss matters with my GP as I don't know how much longer I can go on. I've never experienced anything like this in my life - I've never been in any trouble with the Police, I have a good job and I don't go looking for trouble. It's totally beyond me how anyone can live like that.
I've now taken the step of making a report to the Police Commissioner for our area. I also sent a formal complaint to the Council threatening to report them to the Local Government Ombudsman - lo and behold I finally got a holding acknowledgement out of them.
It's incredibly unfair that people like us should have to put up with such abuse in our own home.