I'm not sure what she did wrong, except for expressing regret for those awful medical experiments.
She violated the time honored principle of not taking our dirty laundry to the public.
Whether you work for somebody or own your own business, you make mistakes, we all do. When that happens I am sure that you correct the mistake and take steps not to let it happen again. People and business do that all the time. The last thing you would consider doing is getting a big neon sign and adds in the paper describing in detail how and what you screwed up.
If Clinton felt that reparations or other action was necessary, she should have gotten in touch with the other government and worked out a fair solution instead of the spectacle of public apology that gives more ammunition to our enemies.