On a thread several months ago one of the lost causers was straining to present some sort of tu quoque and stumbled over the established practice of using some slave labor in the building (or in this case rebuilding) the capitol building. by established I mean the practice had been going on since before the commissioning of Washington DC - certainly far before the Lincoln administration.
With larger and more pressing matters on his plate I doubt that Lincoln was even aware of their presence.
I find it laughable that lost cause losers critically point to a condition that was insisted upon by their side os some sort of failing of those on the right side.
Another nothing-burger.
It looks like your tacit acknowledgment that Lincoln did, in fact, use slave labor to help build the Capitol has settled her hash.
I wasn't even going to bring it up until she mentioned it.