wondering will it just be easier to get the mrs a scroll saw, something like a hegner se with variable speed. then she can cut custom shapes from soft 1050grade aluminium with that. i tried on the aluminium myself with a jigsaw and metal blade, it cut fine so a scroll saw with metal blade should be good.... all be it slow but maybe ok for custom one off stuff.
From what i can see on videos on the net a cnc router would make a mess of soft aluminium.