I imagine 'The Hand' is measuring her up for the guillotine, which is why she isn't looking very thrilled about it :(
That is an interesting observation that you have about the drawing. Often I find that my subconscious thoughts always makes its way to the surface through my drawings. I originally intended to so make a funny drawing that would reflect this saying. Instead I have created this kind of perverse scene where Marie Antoinette's captors playfully tease her which contrasts the horrific events that are soon to unfold.