For me, this would be a moment that leads to a poor explanation when an alternative exists.
Joko. Specifically his "undeath" that is transferred to Aurene.
The tool her mother used to allegedly cheat death is actually the Shield #4 skill on revenant: Crystal Hibernation.
It stands to reason that Glint could have given this knowledge to Aurene when they had their "private chat" while the Commander had to go another route.
I have many problems with just chalking it up to "Joko is undead, so now you're able to come back to life!"
In many other media where Liches exist, they typically have rituals and other contrivances to consider to afford them their undeath. Now, I do realize that GW2 might operate under other circumstances. Though, phylacteries exist (as trophy chests) and I have to wonder if there are any further implications or if it's simply a place where mechanics and lore diverge.
Going back to Crystal Hibernation for a moment, the skill blocks damage and heals over an interval. The GW1 is even more powerful: Skill. (monster only) For 20 seconds, Gain +7 Health regeneration. Whenever you would take non-physical damage, gain an equal amount of Health instead.
I would have much rather seen Aurene come out of a sort of Chrysalis/metamorphic process than simply "yep, I ate a very persistent dead guy."
Potential requires action in order to be realized.