Well let's be clear here, all that would be a LITTLE extreme. 'What she wanted' in that case would have to be, like, a sure shot 100% guaranteed victory over Ulthuan, and probably also getting Aenarion to admit he loved her the most somehow.
In this case, it's effectively:
Informant: My lady, the Barbed Soul Coven has accepted the commission of the Witch King! They have joined with the Supreme Sorceress Haeletha and El'tha and their own Covens as well!
Morathi: Wonderful. Slave, mark down in my calendar a note to increase the wards on Ghrond again. And you, my informant, shall watch for those who shall rise to take their places after they're gone.
Informant: ...my lady?
Morathi: Of course most will wait until the crater is filled back in with snow, but there's no reason not to be proactive about it.