I've asked this before, but it's been long enough so I will ask again- Considering Jane's ability to revive everyone a single time regardless of 'how dead' they are, wouldn't she be able to revive Nepeta and Feferi in the same way?
We don’t know the limits of Jane’s powers or if she can only revive fresh corpses, only that she can revive a person once and then never again. My guess is that no, she cannot since Feferi and Nepeta’s corpses were cut up by Gamzee.