How "beloved" Abraham Lincoln is depends a lot on where you're from.   Mary Todd Lincoln was probably what we'd now call "bi-polar," and then was a woman that would have been considered "hysterical" at times.   She did endure some tragedy, especially the death of the son, but suffice it to say that her relationship with Mr. Lincoln was "difficult."

In terms of being hated, I don't think Mary Todd Lincoln even ranks; she had a tough life after Lincoln's death but that didn't make her hated.   Probably for outright hate, at least from the "proper" class of society, nobody is in the same league as Andrew Jackson's wife, Rachel; she was excoriated by the "proper" ladies of the political class and vilified as a "bigamist" since her divorce from her husband was on shaky legal grounds when she married Jackson, and in those days, just being a divorcee was enough to keep you out of proper society.