Graendal being involved in the plan I don't have a problem with. The stretch is given she knew if it failed she was stuffed, then why did she leave it to the Trollocs and Fades? She's got an Angreal, knows how to invert weaves and hide her ability, yet doesn't attack Perrin's forces at all when they are fighting. The battle could easily have gone against Perrin with her actively opposing him.

She's not the Spider, and she's not going to face Rand there, that's the bit that doesn't 'sit right'. 'Oooh, I've got a plan that will save or destroy me, if I don't join in it's likely the latter. I know! I won't join in!'