Maple, As in the syrup extracted from the tree's. I can't believe I didn't get the link between her name and her character, she's slow running and sweet like the syrup.
I think she drowned the fake with her own poison. Wind magic and Leap to collect the pools of poison, then sword fighting to animation lock the fake into blocking with the shield.
Generating her own water would consume too much MP, and she needs the space to dodge anyway.