No one on this thread says she can. The Church doesn't teach she saves anyone. It teaches Jesus alone is our Savior:
Catechism of the Catholic Church paragraph 480: Jesus Christ is true God and true man, in the unity of his divine person; for this reason he is the one and only mediator between God and men."
"Our God never sends apparitions of people. He sends angels or comes Himself."
Tell that to Saul when Samuel appeared to him (1 Samuel 28). Samuel would not have appeared if our God did not him to deliver a message to Saul. Tell that also to another Saul-- Paul of Tarsus:
Acts 16:9 And a vision appeared to Paul in the night: a man of Macedo′nia was standing beseeching him and saying, “Come over to Macedo′nia and help us.” 10 And when he had seen the vision, immediately we sought to go on into Macedo′nia, concluding that God had called us to preach the gospel to them.
A dream is different from an Apparition