Hi Pina colada
... .my sister sent me information after she was diagnosed... .which she now denies... .huh?
I can imagine that this turnaround would be quite frustrating. How did your sister behave after she just got diagnosed? Other than sending you information did you feel like she showed any true insights into her own behavior and how it affects other? Did she at the time seem committed to you to doing the work to help her better manage her difficult thoughts and emotions?
It helps to have familial support as she is evil and mean and takes any chance she could to lie about me... .She is a mean, evil and unhappy human being.
Having support can definitely be very helpful as it really can be quite difficult dealing with a BPD family-member, especially when that person is unwilling or unable to acknowledge his or her issues. BPD is a serious disorder and people with this disorder unfortunately tend to have quite distorted thinking patterns and perception, resulting in behavior that can be very unsettling.
Does it help you to consider her as evil, perhaps as a way to understand or process what you've been through with her?
Do you truly believe your sister is evil or would the term disordered or mentally ill perhaps more accurately describe her condition?
She trampled my boundaries... .My world is safer without her venom.
I am glad you are feeling safer now

I think with boundaries it is important to keep in mind that they are mainly about us and protecting ourselves. There is no guarantee that the other person will respect our boundaries or react kindly to us setting them. Regardless of how the other person responds, the crucial thing is that we are willing and able to not only set the boundaries with them, but also to enforce/defend those boundaries.
You are currently NC with your sister, which in a way also creates a certain boundary or at least a space where you no longer have to deal directly with her behavior. When you were still in contact with her though, did you feel you were able (and willing) to set boundaries with her?
The Board Parrot