Sylvanas digusted with the Forsaken only able to stand their presence because they give her power:
"Before her waited a grotesque, quivering mass of corpses, their armor piecemeal, their bodies broken, the stench unimaginable. Their plaintive, desperate gazes reminded her suddenly of children.
They disgusted her. But their need empowered her" - Edge of Night, Page 3
Sylvanas on how she really feels about the Forsaken after Arthas was dead:
"They had been honed into the perfect weapon. Her weapon. And they had struck the killing blow for which she had built them.
She cared nothing for their fate.
"Let them perish!" Sylvanas cried. "
I am finished with them!"", Edge of Night, Page 4
Sylvanas musing on how the Forsaken are there for her personal protection:
"The army of undead that surrounded and protected the Dark Lady was still hers, body and soul. But they were no longer arrows in her quiver, not anymore.
They were a bulwark against the infinite. They were to be used wisely, and no fool orc would squander them while she still walked the world of the living." - Edge of Night, Page 7
Here the link to the full story, if this was not enough:
https://worldofwarcraft.com/en-gb/st...nas-windrunner