I'd like to say I'd hit a woman back
Why would you hit a woman?
She's my sister's friend, they're very rude. They spread mean rumors about me and my sister.
She is wrong to spread rumors. But you shouldn't resort to violence!
So I shouldn't hit her? Fine! I'll talk about her behind her back then.
If you hit her when she only used words nobody will be on your side. If she calls the cops you will go to jail, The best thing you can do is ignore the lies and move on.