Iffy on if they took it back.
Exploring Kalimdor makes it seem like Ashenvale is in the Horde hands as Zekhan says Night Elves are getting killed and he doesn’t understand why they are still doing it since they are so few in number.
In addition, while they “technically” hold Darkshore, the reality is it’s completely uninhabitable. The Forsaken plagued it.
It should be noted that Darkshore was basically uninhabitable BEFORE the plague because of it’s climate and the storms, and I think it was Stormrage that made mention Auberdine was the only settlement since the War of the Ancients that managed to be successful and only because it was needed for a dock