I also wouldn't go escalating this.
The landlord told you that the tenant made certain claims.
She could deny this.
There's also a possibility that the landlord misunderstood, is not relaying things accurately, or could even be making it up.
Basically what you're complaining about is second hand info.
And you're making assumptions about what other people might have been told with absolutely no evidence.
You go accusing her of defaming you and she could claim that you're harassing/defaming her.
I would just ignore it.
The landlord told you that the tenant made certain claims.
She could deny this.
There's also a possibility that the landlord misunderstood, is not relaying things accurately, or could even be making it up.
Basically what you're complaining about is second hand info.
And you're making assumptions about what other people might have been told with absolutely no evidence.
You go accusing her of defaming you and she could claim that you're harassing/defaming her.
I would just ignore it.