Luminara Unduli was unable to sense her apprentice’s change of heart over the course of the Clone Wars. If she did, she most likely would have stopped Barriss Offee from bombing the temple’s hangar. If she did, Ahsoka would never have been exiled. You could argue that Anakin would never have turned to the Dark Side if Ahsoka was still around. It’s crazy to think how certain events would be completely different if things beforehand went a different way.