She had already met 2 Gods prior this meeting. She would not have discounted the meeting as a dream. Even if she did believe it was a dream, Leeana would have regarded what Isvaria communicated to her as real. The gods cannot truly enter this contested world and so any manifestation is not "Real" but dreamlike to some extent.
Oline wrote:Actually what interfered with the wizards scrying was in fact her wedding bracelet as far as they themselves could tell. I suspect in part that the periwinkle was to make sure she knew the encounter with Isvaria was real rather than a dream or imagined. This encounter may have been to set something else up but it might also have been to reassure Leanna about her life course.