A couple of specifics:
When he tries to set out snakes while in range of your 2B, you can react and punish with 2B and jump cancel the 2B to avoid the snake.
If he sets out a slow moving crow, sometimes they wont be prepared for dash up to trigger it and ex shield it. You can sometimes catch them with this, but prolly not so well if he also sets out snake. You can also jump cancel ex shield.
If he j.Cs and you j.C near the same time from max range, your j.C will win. Especially if he is above you at neutral. Your j.C starts 2 frames faster, so she can out space him in some of his IAD j.C spacing attempts.
I don't think she has a good super to use like F-Arc does for grabbing through snakes and stuff. This is one of the match-ups were playing F-Arc is better. While I don't think that C-Arc can't win or even do well, F-Arc has better tools for dealing with Nero.