I bet any of the Faerie queens could do remove or greatly restrict the Whampire demon if their job description allowed for it. I don't know if any would. My bet is on Mab and Titania's job giving them the power to do it solely because Mab threatened to make Thomas the Winter Knight and I don't think she would want competition for control or influence on Thomas.
I'd have to re-read the passage for the precise wording: it
could have been just a bluff, a pressure-tactic against Harry. But even so, I'd bet that Mab is entirely-willing to use a Whampire's hunger-demon as part of her manipulation-campaign against a Winter Knight.
Thomas would be especially-vulnerable:
- isolate him from Justine "because training"
- give him tons of hot&eager wintersidhe (from whom he can feed freely without risk of killing them.
Condition him to be unrestrained & incautious. Then, when he has done some mission that made him spend deeply from the Whamp reserves, is desperately (even catastrophically)
Hungry:
- make all that Faerie Hotness "unfortunately-unavailable"
- toss a vulnerable mortal Doe his way
Let the virtually-inevitable happen. Lather, rinse, repeat.