Disclaimer: I will not focus on Art or grammar, unless the latter would make the deck too difficult to understand.
Similarly to Carly Lawrence, Jenny Marble just feels really well put-together all around. The idea is clear and simple, yet also seems interesting to put into practice and play against. It's also a hilarious mental image to just picture whatever cards you play hastily trying to destroy all the "Clues" on the table, to get her off their trail.
Of the two Plans to Win, I have to say the second one is the more interesting one to me? Turning all your Clues into actual threats is a big thing, and makes for great moments (and mental images) if played right. For Plucky Detective... It likely works out really well in practice, but with only a pure readthrough, the ability to attack directly conditionally feels slightly odd to me to think about? Maybe something to let her create more Clue tokens more actively would feel more in-line for the Detective of the Deck? However she would then use those to accomplish a win scenario is a bit more of a question mark, though, and the vibe is definitely there with the other cards too.
Granted, all this is mostly quibbling. I really like this idea of yours as well, and I think it would be really fun to play against, and the character fun to mee.
Good job!