Arathandris Silversky

Arathandris Silversky was a night elf quest giver located southeast of the Emerald Sanctuary in Felwood. She started the quest chain Cleansing Felwood for Alliance players; Horde members looking for their version would speak with Maybess Riverbreeze to the north. She has been missing since the Cataclysm, her status and whereabouts unknown.

Quests

 * Cleansing Felwood (Alliance)
 * Salve via Disenchanting
 * Salve via Gathering
 * Salve via Hunting
 * Salve via Mining
 * Salve via Skinning

Quotes
"Darnassae?"
 * To Horde players

The night elf druid looks at you expectantly, but it is clear you cannot verbally communicate with her. Undaunted, she points to herself and smiles. She points at you and smiles once more. She finally motions several times down the path to the north.

Perhaps she is indicating that there is a druid you can speak to further up the road?

There are plants in Felwood that may be saved from corruption when Cenarion plant salve is applied to them. I know how to make the salve from several different kinds of items; based on your skill set, you may find that you have multiple options to assist me.
 * After the initial quest

You will also need a Cenarion beacon for your work here; it is a device that allows you to see the taint and corruption of nature that the naked eye will miss.

Relatives
She may have been related to Sentinel Silversky.

Darnassae
The general guess was that this NPC was asking Horde players if they spoke Darnassian, based on the converse question asked by Maybess Riverbreeze of Alliance players: "Taurahe?"