What do you mean by "done the job"? It is what logically follows, I don't care of her retort because she has shown low reasoning abilities by putting forth her original argument in the first place. Honestly, if logical arguments "did the job", we wouldn't be in the place we are right now, one needs the foundation to recognize these arguments and accept them as true and from there make adjustments for it to "do the job", without this foundation, well then, it's just rhetoric, or "dunking on people" in debates, pure sophistry.
But if you were asking for something specific in a quick retort manner, maybe the best you can do is ask "Does not being the originator of a wrong alleviate an individual of wrongdoing?", and in response you would likely get some dancing followed with "we outlawed slavery first", "we did this and that already", all of which from a rhetorical point of view strengthens your position before the public and you would simply ask the question again and then close out the segment with her being silent for a bit, there, you won the rhetorical plane but this doesn't progress reasoning, just further muddies the water for a rhetorical trick to follow in response, down the line.