Dexa features as a mother. She appears in VOY Homestead, Unworthy and Children of the Storm, if I'm not mistaken.
She also appeared in the episode where Neelix leaves the ship.
But, as I recall, Talax was destroyed, hence they are like the Vulcans in the 2009 movie.
That would be Voyager
's "Homestead," already mentioned by tomswift2002
And I'm fairly certain Talax wasn't destroyed. The population of Rinax, one of the moons, was completely wiped out by the metreon cascade, after which Talax surrendered to the Haakonians. But I'm pretty sure the homeworld was never destroyed, or I think Neelix would have mentioned it.
Yes. Talax seems to have become a Haakonian protectorate, while Rinax--a fairly populous class-M moon--was wiped out.
In the Mirror Universe, FWIW, Talax was wiped out by the Haakonians. DeCandido's novella makes a point of noting Neelix's despair at being one of the few survivors of his entire species.