Nitta left her in some sort of suspended death state
if someone made her recover it would've been said by now.
The thing I could see Gege doing is keeping Nobara in that fukked up state (Nitta can make wounds stop hurting and slightly heal, maybe she got a pulse by this point lol), which is why Fushiguro was like
the last time Yuji asked him about Kugisaki.
And yeah, Gege clearly doesn't know wtf to do nor does he care. He gave Maki the lead female role by making her
Toji 2.0.
After re reading Shibuya and today's chapter I think we'll know about Nobara in the last chapter of the manga. Either someone goes to her grave or someone "finds a way" to heal her and we see her alive and having a funny chat with somebody.