#1 - Nov. 2, 2014, 6:09 p.m.
No lower population realms will be able to kill her the entire DMF event (we killed her, but with 40 or more people).
Is a fix incoming for this?
UPDATE (11/3/2014)
Moonfang and other DMF mobs were hotfixed back down to pre-WoD levels, as per the latest patch notes.