LazySageDao
Once again a correction, Saber is stuck in a materials state, (She was also stuck in a material state in Fate/Zero) Due to her technically not dying, she made an agreement with the counterforce before she died, So she could seek The Grail to make her wish come true, (That she would never draw the sword Caliburn) So she's currently in a state between life and death, Or something like that. And once again you can quite easily search this up on the TYPE-MOON Wiki.