For words that are Vertical you slash Horizontally vice versa for Horizontal words. For Diagonal words, slash whichever direction the orientation of the word is.
so if it's angled like this: /
you press both up and left at the same time. As always you're looking for a gold word you can dispute when you find it make sure you have the correct evidence sword then press the button to draw your sword it will auto slash, if it's correct the rebuttal will end.
If you mean a general hint for the correct word to counter her argument: Show Wenona proof
Happy to assist more if this isn't enough.