Towards the end of the last book, things pick up with her.
That said, it will be interesting to see how they go forward with the next season. Season 4 jumped into both books 4 and 5 while they've been saying that this really wraps up with book 3. I'd imagine they have one good season left before they run out of material (as book 6 and 7 aren't out yet).
Definitely thought this was one of the better seasons yet. Really enjoyed it.
Sounds like there is an excellent chance the show reveals the conclusion before the books do. Especially since, by most accounts, Martins work in this series tails dramatically in quality after Storm of Swords.