The term narcissist seems to be the latest ‘woke’ word used for people you no longer like or never did.
From reading your opening post, you describe this woman, who has been in one of your social circles, as charming, attentive, narcissistic, manipulative, draining, flirty, pretentious and glamorous.
You’ve suddenly concluded and diagnosed her with a mental disorder claiming she’s too toxic for you and how she’s now stalking you by leaving messages stating she’s worried and concerned for you.
She’s leaving all kinds of messages because she didn’t get the memo claiming she’s a selfish, toxic , manipulative, pretentious, narcissistic stalker. She’s leaving messages claiming she’s worried. There’s nothing abnormal about that. Friends tend to worry about their friends when they don’t hear from them in a while. She doesn’t know you ‘now’ feel this way. You are playing an unfair game with this sudden ex - friend.
If this friend has suddenly become your EX - friend then the fairest thing for both of you , would be for you to tell her that you have moved on and no longer wish to associate with her any longer.
It sounds as though you’ve gossiped about this person to all your other friends to get to this conclusion and are on here discussing it with us. You’ve clearly made up your mind that she’s not good for your health while she’s relentlessly trying to reach you to make sure you are ok.
There’s always 2 sides to every story. If ‘you’ are the one who has suddenly realized that you no longer want her as a friend, for whatever reasons, then ‘you’ should be the one to make your wishes ‘known,’ but to HER!
She might be all you claim, but she still deserves the respect of ‘giving her the “I don’t want to be your friend” memo. Send her a ‘snail mail’ card requesting your desires. You don’t have to give detailed reasons.
I think how you are dealing with this is immature and cowardly.