So maybe Blue (in disguise as Spinner) puts in motion a huge chain of events to try to restore the magic in EF , before it too runs out of magic, just like in NL. So she pretends to Malcolm that she’s just a nice old spinner lady who’ll look after his boy. That’s why these ladies have a bean and give it to Rumpel. They have the gift of sight to be able to guess at what paths might make certain outcomes happen. Eventually one of these fairies goes bad (Maleficient!) and Blue tries to train replacements but never really finds anyone good enough (though Nova and Tink come close but being a master fate fairy is hard, because there are so many times you actually make things worse by trying to help!).
I could see it and fits with the idea of Blue being Sneaky.
I want to add in my own headcanon which is that she is trying to restore magic to get rid of the Dark One’s Curse because if she can do that, then she can bring back her TL, the Shadow of NL.