Salfa has the following quests available which increase Timbermaw Hold faction:
We Timbermaw can grant you safe passage through the hold, however, you must prove yourself worthy of our aid.
What about the Winterfall furbolg?
The Winterfall furbolg that reside here in Winterspring were once our allies... but one day, that all changed.
Driven by strange demands of their high chief, they began to attack all others that they came in contact with, including our tribe. They keep to themselves now...