Warchief's Command: Eastern Plaguelands!

Optional breadcrumb quest to [npc=45417].
Into the Woods from the Western Plaguelands
Visitors from Light's Hope Chapel
Hero's Call: Eastern Plaguelands! from Alliance cities
Warchief's Command: Eastern Plaguelands! from Horde cities
are all optional, exclusive, and unavailable one you progress through her quest chain.

Believe you'll miss this quest if you've continued questing through Western Plaguelands into Eastern Plaguelands, gaining a quest in Western plaguelands that leads you onwards to the location.

Which should result in you missing this quest and unable to complete it also if you taken the above mentioned quest line.

It says so up top, but it's important to note that you CANNOT obtain this quest from the call boards in Org or Thunder Bluff.