Its not you, its her. And no you are not as bad as each other, far from it.
Abusive people are not nasty all the time but the nice/nasty cycle is a continuous one.
It is really not possible to have a relationship with a narcissist and do not contact her at all. Maintain radio silence.
Having a narcissist for a mother is a lot like living under the supervision of a six-year-old. Narcissists are always pretending, and with a narcissistic mother it's a lot like, "Let's play house. I'll pretend to be the mother and you pretend to be the baby," though, as the baby, you'll be expected to act like a doll (keep smiling, no matter what) and you'll be treated like a doll -- as an inanimate object, as a toy to be manipulated, dressed and undressed, walked around and have words put in your mouth; something that can be broken but not hurt, something that will be dropped and forgotten when something more interesting comes along.
My guess too is that she will continue to try and railroad through any boundary you care to set her. I do not personally think that NC is a punishment towards her at all, its about you protecting yourself from being further abused.
It's very hard to have a simple, uncomplicated good time with a narcissist. Except for odd spells of heady euphoria unrelated to anything you can see, their affective range is mediocre-fake-normal to hell-on-Earth. They will sometimes lie low and be quiet, actually passive and dependent -- this is as good as it gets with narcissists. They are incapable of loving conduct towards anyone or anything, so they do not have the capacity for simple pleasure, beyond the satisfaction of bodily needs. There is only one way to please a narcissist (and it won't please you): that is to indulge their every whim, cater to their tiniest impulses, bend to their views on every little thing. There's only one way to get decent treatment from narcissists: keep your distance. They can be pretty nice, even charming, flirtatious, and seductive, to strangers, and will flatter you shamelessly if they want something from you. When you attempt to get close to them in a normal way, they feel you are putting emotional pressure on them and they withdraw because you're too demanding. They can be positively fawning and solicitous as long as they're afraid of you, which is not most people's idea of a real fun relationship.
Narcissists are (a) extremely sensitive to personal criticism and (b) extremely critical of other people. They think that they must be seen as perfect or superior or infallible, next to god-like (if not actually divine, then sitting on the right hand of God) or else they are worthless. There's no middle ground of ordinary normal humanity for narcissists. They can't tolerate the least disagreement. In fact, if you say, "Please don't do that again it hurts," narcissists will turn around and do it again harder to prove that they were right the first time; their reasoning seems to be something like "I am a good person and can do no wrong; therefore, I didn't hurt you and you are lying about it now..." sorry, folks, I get lost after that. Anyhow, narcissists are habitually cruel in little ways, as well as big ones, because they're paying attention to their fantasy and not to you, but the bruises on you are REAL, not in your imagination. Thus, no matter how gently you suggest that they might do better to change their ways or get some help, they will react in one of two equally horrible ways: they will attack or they will withdraw. Be wary of wandering into this dragon's cave narcissists will say ANYTHING, they will trash anyone in their own self-justification, and then they will expect the immediate restoration of the status quo. They will attack you (sometimes physically) and spew a load of bile, insult, abuse, contempt, threats, etc., and then well, it's kind of like they had indigestion and the vicious tirade worked like a burp: "There. Now I feel better. Where were we?" They feel better, so they expect you to feel better, too. They will say you are nothing, worthless, and turn around immediately and say that they love you. When you object to this kind of treatment, they will say, "You just have to accept me the way I am. (God made me this way, so God loves me even if you are too stupid to understand how special I am.)" Accepting them as they are (and staying away from them entirely) is excellent advice. The other "punishment" narcissists mete out is banishing you from their glorious presence this can turn into a farce, since by this point you are probably praying to be rescued, "Dear God! How do I get out of this?" The narcissist expects that you will be devastated by the withdrawal of her/his divine attention, so that after a while a few weeks or months (i.e., the next time the narcissist needs to use you for something) the narcissist will expect you to have learned your lesson and be eager to return to the fold. If you have learned your lesson, you won't answer that call. They can't see that they have a problem; it's always somebody else who has the problem and needs to change.