From wow.incgamers.com

Tabetha is a level 62 Neutral Human, who resides at Tabetha's Farm in central Dustwallow Marsh, south of The Quagmire and north of Stonemaul Ruins.

Quests

She is involved in the following quests:

• Hidden Secrets
• Return to the Marsh, which leads to:

The Infernal Orb
The Exorcism
Power in Uldaman
Mana Surges

• Items of Power
• Celestial Power
• Cleansing of the Orb of Orahil

Returning the Cleansed Orb

• Tiara of the Deep

In Patch 2.3 she starts the following quest:

• Help for Mudsprocket