I keep coming across women like that, and quite often I am on the receiving end.
I had problems with a so-called friend at secondary school who claimed to be my friend but frequently told people I'd said things and hence they didn't like me or wouldn't talk to me.
I then had it a few years ago in a group of friends. The alpha female of the group bitched about everyone and ruled the roost. She took a dislike to me at one point, and the whole group started being funny with me and I was left out of arrangements. She told people that I had said things about them, which I hadn't done. just like the old schoolfriend had done, and some of them still blank me to this day.
I swore I would become a better judge of character and suss out this type of person again in future. However in the past couple of years I've become friends with a woman, within a group of friends. Alarm bells should have started ringing when she kept talking about others to me and being really unpleasant about them, but I carried on being friendly with her. However as I couldn't attend her birthday meal last month she got the hump, and now she too is doing the same thing. Luckily not every friend from that group has turned against me, but some have, as again she is telling them I've said things that I haven't, and telling them I am depressed, mentally unhinged and that I am best avoided! Which isn't true.
Why are some women like this? I'm genuine, a bit quiet, but try to be a decent person, and people like me always have to suffer and lose friends because of women like this