well, Uhura actually helped him get in his volcano suit without a fuss and she was supportive and even joked with him. You see her concern for him only when he basically can't see it (when he's finally lowered in the volcano). There is no example in either movie where she ever stopped Spock from doing his job and duty (a point also made on reverse when you can see he is concerned himself when she asks Kirk to let her speak with the klingons but he doesn't stop her) at the very least she might stop him to ask what he's doing (see in the first movie when he wanted to save his parents and left his post to do that) but it doesn't seem to me that Uhura has a problem with Spock doing his work, regardless the fact that as his SO it's only natural for her to have an emotional reaction about the idea of him possibly dying. Still, it seems to me that even when Spock was in the volcano, she still did her job on the bridge while Scotty and McCoy were exactly doing what?
As an officer she also proved she's capable to put herself in dangerous situations to help her crew mates (both with the klingons and then later when she stopped Khan from killing Spock)
Obviously, her problem was not Spock putting himself in danger doing his duty. It was his weird behavior in the volcano and him being so adamant that they had to leave him there to die. His apparent acceptance of his death as if his life was nothing at all. No word for her, no goodbye. And when they save him, no thanks. He actually seemed annoyed they saved him. Uhura implied she had tried to talk with him about this and the fact that he seemed to have a death wish.. but he refused to talk about it.
I don't know how someone can really think that his behavior wasn't at the very least a bit weird. He was obsessed about the prime directive, and yet his own behavior went against that rule when he interfered with the planet by stopping the volcano.
He was willing to die to save these people (in the way he couldn't save his
cit Abrams) but he wasn't willing to use 'technicalities' to let the enteprise find a way to save him and from their pov he showed no sign that he cared to live, at all.
That behavior was not heroic, unlike Kirk in the end Spock was a given a choice to save both the people and himself and HE didn't want to take it.
that Spock had a death wish/ptsd was widely implied in the comics too where he keeps being too impulsive in the missions and he seems to be uncaring about his life. Uhura noticed that and knew that he also had nightmares about vulcan but he was on denial and refused to acknowledge his state (again, that's more human than anything here) he promised her to be more careful and rational and then the nibiru accident happened..
As an officer she also proved she's capable to put herself in dangerous situations to help her crew mates (both with the klingons and then later when she stopped Khan from killing Spock)
Obviously, her problem was not Spock putting himself in danger doing his duty. It was his weird behavior in the volcano and him being so adamant that they had to leave him there to die. His apparent acceptance of his death as if his life was nothing at all. No word for her, no goodbye. And when they save him, no thanks. He actually seemed annoyed they saved him. Uhura implied she had tried to talk with him about this and the fact that he seemed to have a death wish.. but he refused to talk about it.
I don't know how someone can really think that his behavior wasn't at the very least a bit weird. He was obsessed about the prime directive, and yet his own behavior went against that rule when he interfered with the planet by stopping the volcano.
He was willing to die to save these people (in the way he couldn't save his

That behavior was not heroic, unlike Kirk in the end Spock was a given a choice to save both the people and himself and HE didn't want to take it.
that Spock had a death wish/ptsd was widely implied in the comics too where he keeps being too impulsive in the missions and he seems to be uncaring about his life. Uhura noticed that and knew that he also had nightmares about vulcan but he was on denial and refused to acknowledge his state (again, that's more human than anything here) he promised her to be more careful and rational and then the nibiru accident happened..