Hey everyone -- here is a little information behind this quest -- Hidaga currently only gives out 12 quest completions per spawn, which may have been why she left in a hurry. Also, once the first player completes their quest by hailing her, she only waits for a short while before porting out unless another player comes to her with the quest. I have removed this timed departure, so she will now wait around for much longer, but will still only complete up to 12 quests.
On a side note, I increased the spawn rate on the Arbiter to be more in line with other rares found in the zone. I hope this helps. - Celrak, EQ Designer
I've just increased the amount of time this NPC will remain up to 30 minutes but Hidaga will still only give out a set number of flags before despawning. I'm passing it to QA and we'll get it out to the Live servers as soon as possible after it clears QA. - Nodyin, EQ DesignerThe full thread is here.