What you are describing really does sound like Revisiting Narnia.
From that book:
"When Aslan first appears in this story he is visible only to Lucy,
silently urging her to follow him. Peter balks at this. As Peter would
later say, rather reasonably, “And why should Aslan be invisible to
us? He never used to be. It’s not like him” (383). When Lucy cannot
convince her brothers and sister to follow her vision of Aslan, she
gives up and goes with them. Later, Aslan chastises her for not
leaving them to follow this mysterious vision of him on her own.
Even when Aslan does finally appear in physical form and talks with
Lucy, it is clear that the rules are not the same as they were during
the events of The Lion, the Witch and the Wardrobe. Lucy complains..."