1.4.01: Who ordered Melindhra, and why?

In [TFOH: 34, A Silver Arrow, 390], Nynaeve and Birgitte are eavesdropping on the Forsaken Conference in Tel'aran'rhiod. Rahvin says, "He [Rand] will concentrate on you [Sammael], ... If need be, one close to him will die, plainly at your order. He will come for you. And while he is fixed on you alone, the three of us, linked, will take him. What has changed to alter any of that?" So, it seems Melindhra was ordered to kill Mat with a golden bee dagger (golden bees are the symbol of Illian, where Sammael was situated), if the need arose. Mat told her that Rand was going to Caemlyn, instead of "concentrating on Sammael", and she attacked Mat right away [TFOH: 51, News Comes To Cairhien, 617], in an attempt to return his attention to Sammael.