As far as the "wife" thing goes, I thought seemed like a bit of slightly odd word choice for wild Forest denizens...and then I remembered the last time this happened. Seems like Forest creatures as a whole might just have a slightly distorted view of human marriage, which makes them pretty quick to assume any sort of intimacy between humans automatically equals marriage.
I wonder if Red would consider her and Ayilu to be married. ...I wonder if Red would consider Annie and Kat to be married. Now that would be awkward!
did the faires see Aata save Shell's life? maybe due to that she's covered in residual energy and they just assumed
I think Red 104% believes Ailyu is her wife and don't even care what Kat and Annie are to each other because they aren't Ailyu or her hair