RG Live WotLK 3.3.5a

https://www.wowhead.com/quest=3741/hilarys-necklace#comments:id=60033

The Horde can complete this quest also, although it is next to impossible to do it at the correct level because the gaurds will kill you.

https://www.wowhead.com/quest=3741/hilarys-necklace#comments:id=96920

I did this quest as a Level 20 Horde shaman. No problem at all avoiding the guards, just watch their patrol area and run to the boy at the right moment. Very fun to see alliance kids don't care whether you're horde or alliance :P

https://www.wowhead.com/quest=3741/hilarys-necklace#comments:id=300289

This quest is acquirable and completable by Horde, as well.

http://wowwiki.wikia.com/wiki/Quest:Nida%27s_Necklace

All the children on the dock are Friendly to both factions, and this quest is easily obtainable by Horde characters by swimming over from the opposite side of the lake.

Quest sollte für beide Fraktionen machbar sein, daher liegt kein Fehler vor.