Yes she do, yes she do, after all when she had full power, she put into sleep entire army before she beat up Celestia and Luna in duel 1 by 1, so yea, sooner or later she will once again be on the top.
That's what would make it so absurd to have her in the nightguard. She is a power equal to or greater then that of Luna and Celestia, regardless of her intentions or lack of desire for power she cannot be treated like a mare underling. She is a superhero not a soldier.
Can you imagine how it would be like if superman joined the army? How would you feel if you were supposed to be on his squad or be his drill sergeant? Even if you were well trained you were still human. That's how it would be if Nyx joined the night guard.
Not really, do not forget that Nyx had full power of Nightmare Moon at her disposal, and Nightmare Moon was stronger then Celestia, and the reason Nyx defeated Celestia and Luna in duel 1 by 1 was because she spend weeks in disguise as soldiers and trained. But this give a question, why Celestia and Luna not bothered to train they fighting abilities, Nyx trained weeks and she won, if Celestia and Luna would take a break from they duties and train they skills, they would stand a chance.
It is a ironic, Celestia and Luna have so much power, and yet they use it phateticly because they are to busy with politics and running the country, that is why mane 6 all time had to do dirty work and why Celestia lost again Chrysalis so easy.
However back to the point, Luna has taken all Nyx power, so now Luna is stronger then Celestia ( Nyx in this comics is like 100 years old, so her powers are still far away from they full potential, so I think she joined Night Guard most to gain experience.
But there is no need to worry, she may be faaar weaker then Luna and Celestia, but at last she train and practice, her special talent is to defend those who are weaker then her, so where she lack in power, she pay up with skills and hard work.
I just hope that she will become hero once her powers develop, but 100 years old trained Alicorn can still be great shield for element bearers.
Yes it is ironic how easy she defeated both of them, considering how much restraint she still held. The question is how fast she would be able to recover her magic, I believe that 100 years are enough to give her at least 80% recovery, but even if we say it is only 20% then it is still 100% more then Twilight and a 1000% more then a regular unicorn. She would still be a superhero. Well I do kind of understand of course, our crown prince Frederik served in the army, he trained to become a frogman (equivalent to a navy seal). It must also have been weird for the other members of to be in the same platoon as their future king. Still it is not the same because he is still a human, while Nyx is more then a pony she is a goddess.