Desconhecido, mas ela provavelmente voltou para a Mirkwood
Tauriel é um personagem original no Jacksonverse, e só existe dentro dele. Nenhuma informação autoritária sobre o seu destino após a Batalha dos Cinco Exércitos foi revelada.
No entanto, em uma entrevista de 2014 com o Hero Complex 1 , a atriz de Tauriel, Evangeline Lilly, pensou por quanto valor você atribui às opiniões dos atores (itálico é sua ênfase, negrito é meu):
HC: What do you think happens to [Tauriel] after the events of “Five Armies”?
EL: You know, it's going to sound very mundane, but I think she goes back to Greenwood — which would hopefully now be Greenwood; slowly but surely it would evolve out of Mirkwood and return to Greenwood — and she goes back to work. It sounds so boring, but ultimately, she has a job. She has a responsibility. She’s the head of the Elven Guard. She's not head of the Elven army — that is Prince Legolas and King Thranduil — but she's the head of the Elven Guard, and they protect their realm. And maybe she doesn’t go back to being head of guard, maybe she's been softened and wouldn't resume her old position, but in a way I feel like maybe she would be even more impassioned to protect what she loves, to protect her home, to protect what's important to her, but maybe she'll do it now with more compassion and a little bit of softness.
Se for esse o caso, então Tauriel estaria ocupado defendendo a Mirkwood contra o ataque que aconteceu lá
1 A divisão de entretenimento / super-heróis do Los Angeles Times