Don't bother trying to explain to others what you know about your mom. It's really hard to see through a Narcissist because they're really good at playing games - and the game is slightly different for everyone, because they need to be slightly different to keep the control.

And quite likely - your mom doesn't necessarily realize that there's anything about her that isn't totally normal. My mom certainly thinks that she's perfectly normal. She'd never accept it, and there's no point in me ever trying to convince her.

So I did what I could - which was adapt my own behaviour. I'm at the point now where I actually have a decent relationship with her. Why? Because 1) I live far away and thus have minimal contact 2) only speak via text (something fb) but if she starts with anything.. I leave the conversation 3) I do not recieve any help from them, and have in fact helped them out on my own terms - she doesn't ask as I won't respond, but I've offered because overall I try to be a nice person and saw they could use help financially. and 4) it is very easy for me to withdraw even the minimal contact that I have, and my mom has figured this out at least on a subconscious level... and 5) I do not disclose any information about my life that could give her any power over me.

My mom's image that she projects is that of "perfect mother" (hahahahaha) but to be able to maintain that with other people, she has to remain in contact with me so that she can know things about me to prove it to others that she is still who she says she is. So when I talk to her, we talk about innocent topics and I'll tell her things that she likes to hear that makes her feel good... but it isn't anything that could be damaging to me.

so I guess I feed her need for information, but I'm alright with how it goes now, because at the end of it... I've actually taken her power/control from her and this is about all that she can get.