"Did you kidnap Tom Baker?"
1) No, I didn't. (did not specify which Tom Baker. The fae answers about one of the Tom Bakers she has not kidnapped)
2) No, I didn't. (The fae used winter magic to summon a servitor that did the kidnapping for her)
3) No, I didn't. (The fae did not kidnap Tom Baker. She contrived a situation where Tom Baker would die - and then she saved him by sequestering him in a very secure little sanctuary.
4) No, I didn't. (The fae transformed Tom Baker into a dog. Then she kidnapped the dog.)
5) No, I didn't. (The fae mind-controlled Tom Baker to go with her willingly.)
6) No, I didn't. (The fae abducted Tom Baker. She's old enough to have learned English before the word "kidnap" was in use and chooses to use the older form of the language that did not contain the word.)
7) No, I didn't. (The fae abducted Tom Baker. By taking the literal, original meaning of the word kidnap, the question would not apply to Tom Baker because he isn't a kid.)
No, I didn't. (Legally, kidnapping is taking against one's will without legal authority. The fae, being a sidhe knight, does have her queen's authority to arrest a mortal if it would serve the purpose of Winter)
9) No, I didn't. (The fae cast a spell on herself that would temporarily suppress her memory of the kidnapping if someone asked her if she did it - so she could answer truthfully to her knowledge)
Fae can slip through a vague question, answer in the literal truth or the figurative truth if one of those can be misleading, answer in the partial truth, purposefully misunderstand the question itself, purposefully interpret the question to their favor, purposefully misunderstand the context or the situation the question applies to, or even change the meaning of the question/context/situation through their own action.
And all of the above can be done when speaking the direct truth without evasion or refusing to answer. Not the Fae's fault that language is so very flawed, limited and imprecise, is it?