Maybe.
<unrelated>Yeah, I get that you have reasons... but I think lithomancy could easily pass off as a subset of earth magic, and as for the hedrons... while cool, they really aren't a significant part of Nahiri's arsenal as far as I know. They were designed by Ugin and built by Nahiri to form a trap for the Eldrazi on Zendikar. On her own, Nahiri's magic seems to be focused around stoneforging (i.e. reaching into the ground and pulling out mundane weapons, like swords), heavy telekinesis over rock (as seen in the blown-up Markov Manor artwork), and things like causing landslides and erecting protective barriers (as described
here). And also teleportation through stone, as described in the same article. And she's apparently immortal, for some reason. I mean, I know she's kor, rather than human, and I don't know what typical kor lifespans are, but the Mending (which broke planeswalkers' immortality) happened about a hundred years ago, so I'd expect Nahiri to have aged a good bit in that time (like Liliana did before signing those demonic contracts)... and yet, between her
two cards, she doesn't appear to have aged much at all.</ramble></unrelated>