Board Thread:Character Discussion/@comment-25375217-20170504033027/@comment-25926288-20180301212700

Celticank88 wrote: But the show also implicated that it’s impossible for human to become a fairy. So the fact that Fiona was able to become a fairy is either a. She a fairy blood or b. She could have possibly been one cause in fairy tales and folk lore fairies can live among humans. It didn’t implicate that. They set it up earlier in the scene.

TL remarked how Fiona read and learned more fairy lore than most fairies. So, when TL was shocked, it’s easier to assume that TL simply wasn’t aware of that piece of fairy lore as Fiona didn’t picked that out of thin air. TL wasn’t fully aware what she was giving Fiona access to.

I’d say that Fiona read the books and was waiting for a chance to enact the spell she read.