I have to agree with all the other flail.
I almost didn't read this because I am an idiot. But it was everything I could possibly have hoped for. This is how I see Narcissa. Loving in her own ruthless way. (I always imagined that Lucius dealt with Draco's school issues because they both knew Narcissa would tear everyone apart.)
What I love is that she isn't often reactive. She thinks ahead enough that she is almost always proactive, but she can still handle things that come up here or there.