Severe malignant BPD?

[borderfine_pd]

Hi, I used to participate in an online gaming community 4 years ago, after I quit in 2018, I attracted a female stalker that I believe has BPD, but it's not the stereotypical BPD, it's very toxic and malignant. Recently I caught her impersonating other people online, and causing defamation against them, she also likes to sabotage other people covertly, and has extreme stalking issues. I confronted about her behaviours but she has consistently lied with complete ease as if she is a sociopath. I wonder if she really has BPD, and if so, how can she be so malignant? Her friend also talked to me about her, stated that she never really knew who her friend was, her friend frequently used fake pictures, very secretive, nice on the outside but extremely malicious underneath, and can get obsessed with certain people. In the past, I accidentally insulted her one time in a group setting without actually knowing that it's her, and for the next week, she started sabotaging my online business, found out multiple of my social media accounts, many reddit accounts, insulting me under her fake accounts, and causing massive defamation on me. I wonder if this is a mix of BPD with ASPD?