daughter of NPD trying to detach Nmom

I think my mom has the characteristic of a NPD, she always tries to gain control over me using all sorts of manipulation games, belittles me all the time (she doesn't like me and my way of living life), she loves being grandiose, as a child i always felt isolated because she will never let me befriends with anyone and she always quarrels and fights with my friends' parents thus isolated me even more from my already limited social network, she fights with every single friends she has, she always belittles every single person whose mind isn't the same as hers, she always2 screams and scolded me at the top of her lungs over trivial things (up till now, btw i'm 23 and not living at home).

Ive been livin on my own for the past 8 mths, feed myself and paid my rent with my own $$ from my own hardwork.
She realises, Ive been earning quite lump $$. Now she's being extra nice. She always begs for my attention, be extra nice, extra sweet, extra understanding. Which makes me soo sick!! After all the cruel, intolerable things she had done while I's living under her roof and "feed by her", "taken care of by her and clother by her".

I want to get away from her. How can I stay sane from all these? She always tries to call me and always cries. Because she said i'm very bad, very cruel, daughter who never wants to talk or even recognised her "old, tired, used mother who has given up her life to clothed, feed, provide the best edu she could give me".

I will of course give her pension $$ but it never cross my mind I will ever speak to her anymore. or even live in the same country anymore as her.

What can I do to stay sane? I feel I'm becoming distant with everybody else, too, not only her...