Was reading a tumblr post on that very topic just before. Lemme see if I can find it again…*searches*
The Blue Fairy and precognition
Twice we’ve seen incidents where it’s implied that Blue can see events beyond beyond what is currently happening. The first is just before she grants Jiminy’s wish to become a cricket, when she says that Geppetto will grow up to face many challenges. The second incident is a bit more subtle and much easier to miss.
When the Blue Fairy counsels Dreamy to end his relationship with Nova, she tells him that if Nova becomes a godmother and he returns to the mines they will bring untold joy to the world. Interesting words, those. Some people might assume that because the Blue Fairy said that because fairy dust is vitally important in that it powers the world, that’s why she wanted him there — to mine the special diamonds. But if you’re the kind of person who believes the Blue Fairy can see the future, then that moment takes on a whole new meaning.
If Dreamy hadn’t gone back to the mines, he he wouldn’t have ended up imprisoned eventually. And if he hadn’t ended up in King George’s dungeon, Snow would never have escaped — or if she had, she would have become a far darker character without Grumpy there to slow her down enough for Charming to get to her. Or worse, died.
It’s not surprising that the Blue Fairy wouldn’t want that to happen. She was a confidant of Queen Eva, after all, and likely the family’s patron fairy. And while she may not have been able to see all the details surrounding it (we know how tricky the future can be to read from Rumpelstiltskin’s experience), she likely knew enough to realize that Snow’s child would be important to the world one day — and that Snow wouldn’t have survived to fulfill her destiny of giving birth to the savior if Grumpy hadn’t been there to rescue her from King George’s dungeon (remember, Stealthy was only there to get his brother out).
Suffice to say, if Dreamy had run off with Nova to sail around the world, the world itself could have come to a very bad end. Grumpy’s actions indirectly led to Emma’s birth — the savior who broke the curse to end all curses, and reunited people with their true selves and their loved ones in the process. Untold joy, indeed.
http://whatifqueen.tumblr.com/post/60207459237/the-blue-fairy-and-precognition