Maeve picked a horrible Winter Knight, and wasn't really good at her job based on what we've learned from Molly. When I was actually reading up on Harry Potter lore, I was reading about Grindylow's. Little water demon's known for luring children, and lost travelers to lakes, and ponds to drown them.
Well in a different part of England the Grindylow's go by another name, Jenny Greenteeth. Although I don't find it hard to believe an agent of Winter would do such horrible things, the fact that these demon's are connected so strongly to water makes me wonder if Jenny is a Fomor, or at least an ally of the Fomor. Since Maeve's death we haven't seen anything about her...
Anyone else wonder if she could have been working against the Sidhe while being Maeve's partner?