I will add that I recently unblocked a narcissist on my Facebook (just to see what would happen out of curiosity) and low and behold, he came back looking for me to resupply him, by messaging me, "What happened?" I deleted his message and put him on Facebook block again.

I know you aren't going to block your friend, DechanDawa as that is your choice. I'm just giving you another perspective. When I'm done with people, I'm done with them. Burn me once, shame on you. Burn me twice, shame on me.

Clearly, this narcissist guy won't leave me alone if I don't block him on Facebook. So, I have to keep him blocked now on Facebook, for my safety's sake. Hence my "unblock" to see if he'd leave me alone or continue to bother me. Well, looks like I have to keep him on block now, on Facebook, or he'll continue to bother me with messages.

I'd only leave people on my Facebook and would hide their profile from my newsfeed if I was taking a break from them temporarily. It doesn't seem like you want to cut off this childhood friendship as much as you just want to take a break from her, or you'd just delete her and be done with her.