And I still don't get the earing chapter...
I THINK, after re-reading it super closely, that when Ginko goes to the bathroom, Hime buys her an pair of earrings. Then, before she can give them to her, Hime begins talking about getting matching earrings with her Senpai. Hime, feeling awkward/jealous, ends up not giving Ginko the earrings, instead trying them on herself before dryly stating they don't suit her as she chose them for Ginko. As for the dream, I have no clue. Maybe a metaphor for their relationship or something, where Hime in her dream saying they might not make it is actually her talking about the two of them.