I imagine that Nala makes a
very good, wise Queen and advisor. I think she has shown herself to be fair, particularly in Simba's Pride, when she assists Simba in his discovery that we really are one; that Kovu is just as much of a lion and Pridelander as they are in his heart, which is ultimately the truth. In TLK, it's made quite obvious that should Nala have never of came around and told him how it is, the Pridelands would definitely be destroyed beyond repair and Simba would still be with Timon and Pumbaa in their paradise, eating insects and singing Hakuna Matata. Even if Nala's rebuke did not necessarily directly make him go back to Pride Rock, it did affect him, and I don't think it's fair to the plot itself to say that it didn't. I envision that in every day life, Nala is dignified but I can see her down over with the rest of the Pride, laughing and likely organizing hunting which she may lead. I think that, just as in real life, she plays her part well as a lioness and that it wouldn't be a fully functioning, properly working Pride without her! As much as we love Simba, I don't think he's too wise quite yet.
I just think Nala helps him rule; she advises him and is there for him during times of struggle. I think she values her position as Queen highly, and does not take lightly the duties that she must perform to make everything go smoothly. I think she is very responsible, probably, in her actions, words and mannerisms, much like her husband is.
