Better yet, a little taxidermy and she can mount their heads on a plaque
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That is good for a ‘start’.
Take the cue from local Police and School districts that will take a car that was driven by a drunk student and crashed and then they tow the car to the entrance to the school so ALL students and others see what the results of drunk driving may get you.
Instead of the stuff heads, just put a plaque outside of the house with the names, dates etc somewhat like the makeshift ‘memorials’ that get placed along the highway.
Of course the ‘family’ may want to put flowers and pics in your front yard to ‘grieve’ for the one(s) shot, but just thank them and include there contribution in your ‘warning’ memorial.